Steamworks are usually fairly reliable, one of the better chains. The Berkeley one is conveniently located near to the university of course, which guarantees lots of horny young students (or at least lots of people looking for horny young students).
coveryerteeth is absolutely correct as regards condoms. They are not an option, they are necessity (not just in a bathhouse but everywhere) and don't let anybody tell you otherwise. Don't be off your tits on drink or drugs thus reducing your decision making capacity, because there are people who will take advantage of that. Take care of yourself first.
Having said all that, it can be a lot of fun. As long as you don't go expecting to find the sex-god of your dreams, you shouldn't be disappointed. I've had sex with a lot of guys in bathhouses who I would have thought were way out of my league.
Standard bathhouse procedure is generally as follows - you go in, pay your entry fee. They will give you a key and a towel and direct you to the lockers. You change into the towel and go a-wandering. There will be a wet area - showers, sauna, steam room, jacuzzi - and a maze of some kind to go looking around. The lights will be low and there will be crappy dance music playing. Just sort of explore the space, look for all the nooks and crannys. Other men will be doing the same. If you see someone you like, try following them a bit. Someone may follow you.
EDITED to add: Having just looked at your photos, I should think a LOT of people will be following you.
Talking is rare, it's more done by body language, but it's not forbidden. There are public places to play, which may be a thing you like, but if you don't like other hands coming at you while you're trying to concentrate, there are usually small rooms with lockable doors aswell.
Of course there will always be the nasty old trolls who just wander around trying to weasel their way in on everybody else's fun. But we'll all be old and ugly eventually, so they deserve compassion and a gentle "no thanks" rather than a kick in the groin. Only if they refuse to take no for an answer should anything stronger be needed.
Most importantly of all - you don't need to do anything you don't want to do. Don't let anybody force you into anything. As long as you keep your wits about you, you can relax and have fun. Really that's just a rule for life.
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