If you want to start to write something in English, but can't decide where you begin, then why not try twitter for starters?
First,make your account, and just write anything you like in the box, where you can write only up to 140 words!
You see, this 140 words limit means you don't need, or rather doesn't allow you, to feel that I have nothing to write...
If you don't feel like writing at once, then you can visit other people's site anonymously and see what they're writing. You may find the person who has similar interests to you, then you can send a message that you're following him/her and hopefully start little chatting.
more details, watch the demo video here.