Bottom new to cruising and bookstores

[srtx30]

Hey all, newish to Austin and very new to cruising and bookstore booths and would like to know the etiquette as a bottom only? I have cruised at a park a few times and have only had a single interaction, mainly I don't know how show that I am a bottom only looking to suck or get fucked. The single time, he rubbed my ass as I stopped next to him and well then I followed him, other times we just stand there looking at each other or turned away acting like we don't know the other is there or he wants to go down on me...
As for booths, I am so excited to try a booth and bottom, I have read that ATA is cleanest but assholes that work there and like to talk shit and make fun of guys going in, are there others that are still considered "clean" lol? Do I just walk into one and get my tokens, walk to the back and pick a booth and start playing a movie, then what?
Thanks for the any help I can get and sorry for the noobish questions