This might be a bit off topic but allow me to suggest something immensely useful if you're to write English on the internet.
Use Mozilla Firefox.
Firefox has an integrated corrector which underlines all of your spelling mistakes.
The first thing you could do is to double check whatever your wrote to make sure you didn't make any mistakes. Looking for your mistakes and doing everything you can to correct them is probably the best way to learn a language (well one of the best).
Look at your sentence from a Firefox perspective:
You see, Firefox instantly underlines four mistakes right there. It's an invaluable tool to spot your mistakes and correct them. Right clicking on an underline word will give you the correct spelling. For example:
Asmaa, remember to use the capitalized I and to type "you" instead of "u". It's really off putting to read SMS on a forum about English.
There's a lot of tools out there. Don't be afraid to use them.
