There are a lot of profiles here that look like an independent at first glance but are actually parlor gals. That's because TER accepts reviews of parlor gals but doesn't give the VIP days for them because most parlors don't advertise specific girls, use fake pics, and often have high turnover. So not all reviewed parlor gals have the parlor tag on their profile.
You'll learn to comb through them. If a profile has massage and HJ or massage and BJ or massage nude, with no escort in the cost of service section, it could be a parlor gal. Though that's far far from being a safe assumption. OTOH, a lot of parlor gals will do FS for the right tip, so the profile saying escort doesn't necessarily exclude them. You can look for clues in the reviews like shop, studio, saw another gal in this place, apartment, condo, etc that will help you figure out if it's a parlor or independent.
You can also grab the phone number off the review and plug it into a search. If you search the phone number here and get hits on more than one woman, there's a damn good chance that's a parlor. If you put it into a search engine, you might find ads. Parlor ads are really easy to spot.
You can also go the other way. Nose around places parlors advertise like bp and find one that might suit you and plug their phone number in here.
A lot of this is probably regional and I don't know where you are, so take it for whatever it's worth.
As far as etiquette, read the massage parlor board here. Which is also a good place to ask about the local parlor scene wherever you are. If you do that, I hope you have VIP because a lot of people will want to respond by PM, for fear of their favorite shop getting busted.
Basically, you'll show up and pay the house fee (none of which is hers to keep, usually) and she'll take you back to one of the rooms and say something like "get comfortable" or "get cozy" or "undress to your level of comfort" or something like that, and then leave. There may be a towel or sheet folded up laying on the table. If you strip down and throw the towel over the chair and she comes in to find you nude, face down, with no drape and she takes that in perfect stride, things are looking up. During the massage you can feel her out for mutual touch. If she's okay with that, looking even better. On the flip, a great majority of them will do a ridiculous LE check. She'll say something like "is there any area you'd like me to focus on" and you take her hand and put it on your cock. After that, a brief negotiation usually takes place. A lot of gals will just lay it out at that point. X for HJ, Y for nude body to body, Z for BJ.... Whatever. Some are still really coy and afraid of a bust (or afraid of lowballing themselves) and you gotta let them know what you want and then some silly back and forth to figure out a number. Pretty much the best gal at my favorite parlor has NEVER said a number to me. "Saying a number gets you in trouble" she'll say. I told her what I wanted the first time I met her, she always does a great job for me and let's me decide how much to leave her. She knows I've seen at least a half dozen other women in that shop; I think she's trying to figure out how much they get. That or she can tell I'm a generous schmuck and doesn't want to lowball herself.
I don't think there's any one formula for how sessions or etiquette goes at parlors. There's some nearly universal truths, but you just have to follow your instincts. It also depends on how she feels about you. A different woman at that same parlor had three reviews when I first met her. They all said a regular massage for most of the appointment, she strips on the flip and a HJ and she told them CBJ available for repeat customers. Okay. I go down there and approximately one minute into the massage she's naked too, I'm flipped over and we've both got our hands all over each other. She tells me CBJ next time I see her. Okay. 5 minutes later she's swallowing, and I mean swallowing my dick. No cover. I don't think that means I'm a badass I think it means I caught her in a good mood. I'm just saying there's no one way it goes down. Sometimes you gotta just flat out ask for what you want or whether extra fun is available. Sometimes she'll make it happen.
Only going to parlors that have reviewed gals at first is a good idea, until you get your sea legs at this. At least you know going in there are extras on the table and she's not gonna run out screaming when you make a move.
FWIW, there are a lot of independent women who will give a quality massage with fun extras in a private studio or residence; at least there are in my area. I have found this to often be a better experience for equal or less money. Depends on who you are seeing and what you're looking for. Just something to consider.