My advice is -
1) read the many threads on Thailand and Bangkok!
2) check that your hotel is “guest friendly “ - ask them!
3) try ThaiFriendly - I have met a couple of ladies off Seeking - but they wanted c 10k baht upwards when girls off ThaiFriendly are 2k or 3k for ST, 4k or 5k typically for LT! However ladies from TF are mainly Thai whilst you can get other nationalities on Seeking!
Bars and bar girls vary considerably- some just will chat with you and/or play pool with you for ladydrinks , other you can bar fine if you wish ! So are quite pushy, some are very laid back! Oh and depending on your preferences, be mindful that ladyboys are plentiful in Bangkok - some are quite masculine and obvious but some are very feminine, good looking and much more difficult to recognise. But, providing you are polite, you shouldn’t have any problems asking them !