"I need more practice writing texts in English. How can I do this?" "If you have any interesting examples, could you please write about them? Also, if I've made any other errors, please tell me." The best thing to do is go to the Notebook section on italki, and start writing! Yes, you will make many mistakes (we all will), but this is how you learn not to make mistakes. There are members who can help you. :)

Don't be afraid of making mistakes. Making mistakes means that you're learning! Try to talk with a native speaker as much as you can and ask them to politely correct your mistakes. It will help you a lot :)

But I am afraid to make mistakes. How do I know the right or wrong written?

I would say, you can better start writing what you do on a regular basis. Like you can write what you did yesterday and then you start telling either yourself or someone without looking at the page. This can help you improve your writing as well as your spoken English.