This september I'll start to work - I'll treat children I will be a paediatrician. I think it is a great responsibility, for this reason so i'm I'm a little afraid. 

Wish me good luck)))

1. 'I'll treat children' - I see from another notebook entry that you are a paediatrician so I understand, but it doesn't sound right. Perhaps it is better to say 'I will be a paediatrician' or 'I will provide medical care for children' - although it seems like a lot of words, it makes more sense.

2. 'for this reason' is okay but it sounds more natural to just say 'so', i.e. 'I think it is a great responsibility, so I'm a little afraid'

3. 'i'm' - remember to capitalise 'I' i.e. 'I'm'

4. 'Wish me good luck' - in English when we use this phrase we just say 'Wish me luck' so it is not necessary to include the word 'good'