How to practice without a teacher? I'm going to join buddhist group which is in another city so I'll have few occasions to meet sensei especially because she is from USA and she arrives only few times a year to my country. So how should my practice look?
Ask your questions (about how to practice without a teacher) to the Sensei when you meet her. 

Since you appear to be taking refuge in the Sensei, her advice would be the most appropriate (in the near term).