few years back i used site like massage republic and tsdating to get their contact you can even go on tinder to find friends. rates were about 1000 to 3000 back then. there are also short time rooms about 300baht per hour near soi coyboy and sukhumvit areas that are just basically fuck motels.
https://massagerepublic.com/shemale-escorts-in-bangkok
best bet is to walk along ruamchitt hotel at night like this video:
u can even drop by nana or soi cowboy and choose.
when u talk to them on line app, sometimes they may want to videocall you to make sure you're not wasting their time. this is normal. just show your face coz you will get to see their normal face too to confirm your "cravings". Photos are not always accurate.
and always use protection. got stds here and there from street hookers but nothing cant be solved at DSC clinic in singapore. be safe.