I'm new to this hobby and am wondering if
anyone has used thier services and what I should expect...

Very good service, ladies of all shapes and sizes. Good prices. Owners are very honest.  

Houston is one of the rare cities blessed with a number of very good and honest agencies where you get good service at a decent price. You do not have to worry about bait and switch or upsale.

In addition to The WildFlower Group there is also Escape/Amazing Escorts and Uptown Escorts/Sweet8.

Good to know that hey are honest. But again since im a newbie and quite shy what kind of services could I expect for the rates they quote and what are the rules about tipping?

Full service. They have a stated price. If you care to tip above that price it is up to you.