Hello. I'm bigginer and I have a problem with understanding how to sing even with warm up. I can hear nice warm vibrato voice  of the teacher, but when I try to sing anything or do warm up even if my voice hit note proper it sounds flat and awefull. I cant understand will I gain this later or maybe I do something wrong?

Hi, Vassiliy!

I get your frustration. You will absolutely improve with time. The instructors you hear have been training their voices for many years! Good singing doesn't just appear overnight: it's the result of practice over time. 

It sounds like you're referring specifically to tone. We cover tone in the 30 day course and have a separate tutorial dedicated to tone as well: https://www.30daysinger.com/tutorial/getting-better-tone/1.