Learn how to wakeboard before you wakeskate. You'll need to learn how to edge and jump on a wakeboard before you wakeskate but once you get that down throw your wakeboard away and just wakeskate. I blew both of my shoulders out wakeboarding and now I only wakeskate.
There are really no beginner wakeboards, Some of the boards are harder to edge and butter but you can still learn on them. If you don't know your going to keep wakeboarding just buy a low cost board. Don't cut corners on bindings tho. If you buy a cheap binding your feet will hurt and you'll never want to ride again.