Well I'll tell you right now, best thing you can do on a "Dating" site is put down that you're looking for
Friendship, and search for girls also looking for
Friendship. Yes, there are single ones who go on looking for just friends. They're less likely to think you're desperate, and you can just, have fun and see what happens from there.
No point in jumping right into dating, seriously. You should get to know someone first before you start treating them like a date. Girls have gone for good male friends in the past, so getting close to one of them may make a nice dating transition anyways, or even just expand your social circle.