BRITISH ENGLISH IS BETTER! All joking aside, in terms of grammar etc. there are no major differences, there are slight differences in spelling. e.g. color (US) and colour (UK), fuelled (UK) and fueled (US), centre (UK) and center (US), etc. and also differences in choice of words such as on holiday (UK) and on vacation (US), pavement (UK) and sidewalk (US) but not to the extent that a British person wouldn't be able to understand an American or vice versa. In terms of regional accents, I think American accents overall may be easier to understand than British ones (my opinion as a Brit), as British accents do vary quite a bit despite only being a small country. In the UK not everyone speaks Queen's English and many people struggle to understand northern accents when they first come here. However the deep south American accent can also be quite hard to understand (even for native speakers). I guess at the end of the day there is no real definitive answer to your question. I would honestly say just learn English, and you'll naturally pick up on the differences between regional varieties.

Its a bit complex: http://www.differencebetween.net/language/words-language/difference-between-never-and-ever/

ready for this language

i I (en anglais "i" toujours est majuscule) did a study course which obliged me to speak english (Ce n'est pas mal mais comme ca je sais que anglais n'est pas ta langue maternelle. C'est mieux a dire "I did course in which I had to learn English" ou "I had to learn English for my course"). now i I have finished and i I just only ("just" est correct, mais en ce cas je pense que "only" est mieux) know the english terminology for transport, you know just the words (shipping, warehouse,truck,delivery...) i I can't built build ("built" est le passé) a real sentences, my english is not fluid fluent (on n'utilise pas le mot "fluid" en ce context, le mot que tu veux est "fluent"). 

i try I tried ("try" est le present) to speak english with an american once and it was...aww (je ne sais pourquoi, mais je crois que c'est mal dit utilise l'expression "aww" ici) bad!
now i organised I have now organised a trip in to london ("london" doit commencer avec une majuscule) next year for to/in order to improve my english and have the fluidity reach fluency/gain fluency, to be cool in my sentences.*

*not entirely sure what you want to say

It's completely fine to phrase it like that. However if I heard that I would instantly know that you are foreign. A native speaker would say something like "the state you're in there's absolutely no way I'm letting you drive. I'll drive instead."

What tv makes you feel...

I' m not habituated used to watching tv after lunch as normally i work until late but as now I'm now (no et vas equivocar pero aixi em sona millor) on holyday holiday, i can do a relaxed lunch*, have a little siesta and since last week I started to watch a soap opera in on tv that makes me feel very comfortable, calm and sweet*.

It's a about a rich boy who crashed his car against a moto bike/motorbike drived by a girl ridden by a girl. It wansn't wasn't a big accident but this was the way where the boy knew the girl this is how the boy and the girl met. They now like each other and the girl told tells him each everyday (No es molt clar el que vols dir, pero suposo que vols dir que cada dia ella li diu que l'estima) at the same time when she passes through the road to get home. The day after, the boy, Rafael, was waiting for her and invited the girl her (altre cop no et vas equivocar pero aixi em sona millor) to dinner but unfortunally she refused but the boy did a sourprising act something surprising/unexpected (he did a surprising act esta be, pero em sona un amicetta estrany), as he opened this the car and got out a big tissue and a bag full of cheese and grapes so, they could sit down for a little while to eat something and profit get to know something about each one another. They felt fell in love very quickly and after the girl went home, she gave him her phone number.

 

*No entenc :S, vols dir que cuinas o que menjas ?

*It makes me feel sweet? Aquesta frase no te sentit, que vols dir?

Es un molt bo paragraf, em vas impresionar espero que segueixis practicant. Ho sento per el meu catala. 

My favorite tv series (Sé que en español la palabra serie puede ser singular o plural, pero en ingles la palabra "series" siempre es plural)

I really enjoy watching tv series, I'm always watching any them. Currently I've been watching a series named called (named es correcto pero Called suena mejor) "Merlin" and now this it´s my favorite. Throghout the series Merlin and Arthur were friends, and fought a witch. I´m finishing the series, I only have to watch 1 episode more left to watch (otra vez has acertado, ero asi la oracion suena mejor). But, I don't want to watch it, because, I know it will have a sad ending. I keep putting it off , because I know Arthur will be diying die, tha's the last thing I expected!. I´m very sensitve for just about everithing. everything. However, I'm going to carry on watching the series, and maybe soon I'II get find a new favorite series xD.

You have quite good English and a good vocabulary!

A rainy day.

It was a rainy day, the streets was were wet and the sky was full of clouds. We wanted to go walking at park*, but we could not (this is fine but you could say "we couldn't" instead of "we could not" it's easier and sounds more natural. "We could not" sounds rather formal) . So, my sister was very sad, and my cousin was angry. I said to her: -Calm down! we can to (when an infinitive follows the word can, to is never used. E.g. I can play and not I can to play, or I can run and not I can to run) play something inside- but, she to carried on being angry (to be honest "she carried on angry" sounds correct, but I think it would be more correct to say "she carried on being angry"). So, I come came up with to play a board game to play*, I said to my cousin: -Cheer up!- But she said to me: Put a sock in it. However, we ended up playing video games.

* Okay I'm not exactly sure what you want to say here, if you mean to say "Queriamos pasear por el parque" then you would say "we wanted to walk (or go walking) through the park." If you mean to say "queriamos andar al parque" then you would say "we wanted to walk to the park".

 

*I am not sure what you're trying to say.