Not to be rude DeST, but what you're asking for and what you're giving away are wildly out of synch. A hosting package, and the
possibility of $20, for hours and hours of tutoring? Think of it logically, if someone is qualified to actually teach both of these things then their time is worth much more than that.
If you strike it lucky, you'll find a friendly, knowledgeable person who knows about both PHP and CSS (and teaching). But for what you're offering, they're hardly going to come running -- myself included.
Best of luck though, and I hope you're dealing out great PHP code and CSS markup very soon.