First off, chuck overboard ALL the negativity you may have read/heard about the NSA, hookups 'for sex only', etc.. Men have been hooking up with other men for the purpose of having sex ONLY for thousands of years now. Like it or not, we will carry on doing so, simply because we can.
Second off, do not buy into the theory that good sex ALWAYS presupposes having deep personal knowledge of and deep emotional involvement with your partner. Sex can be pretty awesome if the two guys are sexually compatible. At times, not knowing him, his issues and his problems is actually conducive to a much better sexual experience.
Third off, drop the idea of 'expecting' anything or anyone in particular. You are neither ordering nor paying for any specific good or service, and hence, are not entitled to any expectation whatsoever. Get going, relax, do not overdo your drinks, and look for the guys who are showing interest, AND do not be shy to show interest in the guys who you find attractive. Lead or follow or...
Fourth off, do not limit yourself to any one particular bar or venue. Do some hopping in the 'hood to get the clear lay of the land before you. At times, seeing a familiar face in a short span of time can be conducive to interesting further developments.
Fifth off, leave any level of naivete back home. Guys will tell you all kinds of very truthfully sounding stories (if you let them) either to get into your pants or into your wallet. Stick with your SEX w CONDOMS only policy unconditionally. And carry a small quantity of cash and one easily replaceable debit card with you. Bad things NEVER happen to the guys who are well-prepared to cope with them in advance.
Sixth off, consider sporting a '0-attitude'. Some of the guys you may encounter are married, bisexual, or deeply closeted homosexual dudes. The others are there cheating on their partners (or not?). Some dudes are in there for money, etc.. Remember that you are nobody's moral guardian, and assume that all the adult men know how to take care of themselves. Whereas this may strictly not be true, it is neither your nor my duty to set these guys on the right(ous) path. Focus on landing a hot dude or two or three
and having some good, ole fun. Feel free to leave/exchange phone numbers if you believe that the experience is worth repeating.
And last but not least. A number of young(er) dudes out there, obviously lacking life experience will gladly stipulate that they do NOT expect to find the love of their lives on the Grindr, Scruff or while casually cruising for sex at one of the commercial gay establishments. The truth is that love runs its own business as it finds fit, and that you have a chance of starting a great friendship, relationship, etc., with a dude with whom you have just had a NSA sex without knowing much else about him at all. Sex is a most essential part of any equation involving two gay men. If the sex bit works, the two guys may be likely to put in some honest work in making sure that their friendship works, too.