I suppose you meant "tongue"?
You are right, many professional teachers would say it's good practice because students tend to think in their first languages anyway, so while practising rendering they will learn to use proper English. Others would argue that this way we allow L1 interference that can be very difficult to eliminate afterwards. Still others are trying to compare languages building up on similarities and warning againt "false friends". So, it's up to you to decide which way you will feel more comfortable and engaged in learning; you might want to consider the following:
1. Unless you use a lot of Engish on a daily basis, you will probably initially structure your ideas in your first language. Extensive reading can help skip that stage especially if you take notes of the language you like or find useful.
2. Try to make the process of writing interesting. Today it's not a problem to find a forum to talk about your hobbies, to talk/write to people not because you are learning English but because you have something to say. Be prepared, no one is going to correct you but if you are watchful enough, you can pick up a lot of good English.
3. Learning another language also implies learning another culture and, I dare say, different logic in a way. Personally, I found fairy tales, nursery rhymes and folk music particularly helpful but, I guess, newspapers and films can also do.
On a more teacher-like note, unlikely there can be anything to hinder your progress if you are willing to learn and spare no effort to become fluent in English. Good luck!
- For Teachers