Bunch of good advice already given.
I make friction calls but do not consider myself a "callmaker". Being the back that I am, I would suggest finding an air dried walnut 1x5 or 1x6 and starting there. The Home Depot red oak will certainly work. But I've found good sound easier to get from walnut. Cherry and hard maple are also good and reasonably easy to get sounding good. The very first pot I ever made was from a pressure treated 1x6 deck board. That call could be taken to the woods and used to kill turkeys, no problem. But it does NOT sound like a walnut call would.