Reply to Just Few Questions

My first question is how do i go about getting myself advertised on a budget, My second question is my track library only consists of about 200 tracks how can i expand it more i mean will it just grow with time or is their a sure way to get alot of tracks at once. My third question is should i play as many genres as i can or just stick with genres im comfortable with like house electro and dubstep. Please any feed back would be appreciated.