That's not much in the way of local talent - almost 95% of the talent is imported. Either Thai, Indonesian, Chinese or Vietnamese.
The main red light district is the Geylang neighbourhood - basically any house with a red lamp out front has a fishtank inside. Bunch of girls sitting around for your choice - I think it's SGD 60 for half an hour. Prostitution is legal and the red light district is regulated, so girls go for regular checkups. After you're done, ask around for recommendations on a good restaurant - food is good there. One of the streets also has streetwalkers and there're hotels that chareg by-the-hour.
If you want to pick up, then check out Ipanema at Orchard Towers. There're some other bars in the complex but be warned that trannys are common. A higher priced option is Brix at the Hilton - might have some russian talent.
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If you want to try something different, then take a short boat trip to Batam or Karimun. Significantly cheaper.