You've already overcome the biggest obstacle: money. Apparently it's not an issue for you. It's what is needed most. Just be nice. Treat the ladies with the same respect you would any other woman you would be interested in. Be respectful and follow their rules and you won't have any problems. By rules I mean, for example, some girls only do CBJ and don't like kissing. Others love kissing and do BBJ. If they don't allow greek (anal), don't try to do it. VERY few allow bareback sex but they are out there if that's your thing. Be warned: Bareback sex is frowned upon big time (rightfully so).
My advice: Make sure and shower at their incall or shower immediately before they show up if it's at your place. They appreciate not having to smell ass or sweaty balls and it makes for a better experience for both of you. I generally stop by a store on the way over and pick up a towel, soap, and mouthwash. You'll spend $8.00 or $10 max and it's worth it. You don't have to dirty their towels and it's cheap so you can just shit-can the towel when you're done. If they advertise an hour, the hour generally doesn't start until after the shower, so go ahead and do it.