Bicurious straight guy considering going to a gay bar for the first time

My long distance girlfriend of almost a year just broke up with me, and though I think we'll get back together and that she won't be fooling around with anyone soon (broke up mostly because of not knowing when the distance will end), I'm thinking about trying my first time with a guy. I won't feel as guilty about this as having sex with another girl and she did break up with me after all so I think she'll understand and respect it. I've told her I have this curiosity anyways.What I'm seeking advice on is what to expect, how to fend off the wrong types of guys, how to make sure I'm making safe and smart decisions, etc. I don't mean to offend but generalizations have led me to be scared of contracting an STD. For reference, I'm not really attracted to men, although I find some male physique appealing, I'm mostly attracted to dicks and the idea of sucking on one. Flamboyance is a turn off for me as is drag. Ideally I'd experiment with another guy like myself. If only I could just clone myself I wouldn't be so nervous about experimenting. Please offer whatever advice you can and thank you for your support!