I echo what Blindspot said.
Be willing to put your heart into it, be obedient to the rules, study the Gospel and the Preach My Gospel book and have fun, and love your time there.
One thing that I regret as a missionary was all the time I spent being homesick. When I got home, everything was the same and ok.
As for things to bring...I was really happy I'd taken a pair of rubber dishwashing gloves. They were very nice to have around when we had to un-clog a drain or a toilet. But maybe being a guy those things won't bother you.
Have fun, and don't get discouraged if you're not fluent in Bulgarian when you leave the MTC, no one is.

Joyce