@Серж learning Bulgarian here as a foreigner isn't the easiest thing ever.  I took classes at Sofia University's ичс but they are expensive and intensive so you more or less have to have your whole day free to do it. I pretended that I was studying on my own for a bit and then just stopped because that's way too hard.  Then this year when I started at the American College the school offers us lessons twice a week with a Bulgarian teacher. I also found a language tutor who I meet with on Sundays through my blog.  So my best advice is to ask around and see what connections you have and who would be interested in giving lessons.  I think aside from the fact that Bulgaria isn't taught widely in the States is the face that there isn't a great text book to use to learn Bulgarian.  So I currently own three, lots of photo copies and I've been told to buy yet another text book this weekend by our teacher at school.  Oh well.