Hiii :-) I just wanted to say thanks so much for following and taking a look at my writing, it really means a lot! It's incredibly exciting that you're eager to write and learn and hope to be published one day. That's an amazing goal.
Haha if you take a look at my profile, you'll notice that I haven't posted anything new in a while, and that's because I'm absolutely swamped with work at the moment! I literally can't believe that English is your second language though, judging from your comment, I'd say that you're more than capable of putting pen to paper.
I'm sorry I can't be more help atm, but I'd say that the only thing I really did before posting on Wattpad was to read /a lot/! That's how I always get inspired and that's all I really had in learning about the way sentences are structured and how writing is supposed to flow.
Ooh also, If you go into some of Wattpad's specialty clubs and threads, you can find thousands of editors and critics that would be more than happy to help. I also found that it was a great way to get chatting to people and to find incredible stories you might not otherwise have seen.
Good luck! xx