What will i need to present to customs when i land in bulgaria so i can be sure i wont be sent back?

ok, i am on a budget temporarily i am engaged to a bulgarian. we plan on going back to bulgaria and would like to get married and live there. 1. what all will need to present when i land in the country to ensure i dont get denied entry. pport, cash, etc. 2. we plan to get married asap within the ninety day period i know i need to swear my legality to marry in front of the consulat and get it notorized but after the marriage is complete am i free to continue living in the country with my wife to be or am i missing something in all of this please help it would be appreciated for someone to be straight forward with this i have a month an a half to have my doents in order. 3. if i am going into the country to get married am i required to have a return ticket