First notebook entry: Introducing myself

Hi I'm inmyown.
I came on italki by accident but nothing serious so don't worry please.

I don't understand your meaning here. You found italki by accident? Or you had an accident but nothing serious? You should say 'I found italki by accident.' or 'I found stumbled upon italki by accident and decided to sign up!'

I want to (can I write "wanna" here?.. or it's not good for an educational network?)

You can write 'wanna' if you want to, although it isn't good practise.

be good at English because one can use the loads of information if he knows English.

You went from 'one' (only the queen says that really...) and then said 'he', you switched perspective!

be good at English because then I can use all the information on the internet if I know English.

(I'm assuming you mean all the information on the internet...)

One more thing, one can communicate with many people around the world in English. Me too I believe. If not please let me know.

One more thing, I believe I can communicate with many people around the world using English, if not, please let me know!

Best regards,
inmyown

P.S.: Please don't be too much serious reading my entry

Woops