Stock would be tough. One 750 should get you a decent wake, good enough to learn on. If you don't want to buy a bag yet, get 6 or more good size friends, and have them all sit as close as they can in the rear corner. Buy a big plastic tub from home depot and put it in the back locker, and fill with water using a Homer bucket. That should give you an idea what your wake can be like with and without weight in the rear. Think you will want to buy at least one bag not long after that.
Agree that easiest board to learn on is a big long thick foam core board with big fins (Hyperlite Landlock is what we use, but not sure they still make it). You can learn to go ropeless on that, but once you get to that point, you will want something more maneuverable pretty quick.
If you want to do spins, a skim style board (usually one to three small fins, and usually not more than 58" long) is best. If you are more about airs and jumping, a surf style board with 3 or 4 bigger fins is often best. There are hybrids in between, and this is oversimplified, but it should help you get started.