It's great to watch TV to practice hearing English!

Yellow marks are grammar/spelling corrections.

Blue marks are words or phrases that I changed to make it flow more naturally.

There were two big grammar mistakes that were repeated throughout the writing, but luckily they are easy to fix!

1. The word "I" is always capitalized. 

2. The first letter of any sentence is always capitalized.

Good job, keep writing!

"How I Met Your Mother", do you know this?

Hi I am Julie. Nowadays I enjoy watching TV especially 'How i met your mother' (see earlier correction). This is a sitcom.
I really want to study English speaking, so, one day my friend told me about this program. It might help improve my English speaking. So, I watched season 1, 2 and now 3 is ongoing.
You know? This sitcom is really funny and interesting, and I think it really helps me.
I am nervous when I have to speak English, but after watching this program, I can understand more and I can speak English even better.
What's the plot of this? 
Its main characters are 5 members: Ted, Barney, Lily, Marshal and Robin.
I like Barney the best because he is a funny and eccentric guy. I've never seen someone like him before- really funny- and he is so mysterious. I still don't know about his career although I am watching season 3!
It has 9 seasons already, so I'm going to watching continually.

Do you know other programs on which I can improve English speaking? If so, then tell me!

'How i met your mother' do you know this?

Hi I am Julie. Nowadays, I enjoy watching TV, especially "How i met your mother." This is a sitcom.
I really wanna study English, so one day my friend told me this program, because it might help improve my English speaking. So I watched seasons 1 and 2, and am now watching season 3, you know? This sitcom is really funny and interesting, and I think it really helps me.
I am nervous when I have to speak english, but after watching this program, I can understand more and I can speak English even better.

This is its story:

Its main characters are 5 friends — Ted, Barney, Lily, Marshal and Robin.
I like Barney the best, because he is funny and eccentic guy. I've never seen anyone before like him — he's really funny, and so mysterious. I still don't know what his job is, and I'm watching season 3!
They just finished season 9 already, so i'm gonna continue to watch it.  

Do you know other programs with which I can improve my english? If so, tell me!