Re: New sailing j-22 to a Hobie wave
I'm biased towards monohulls, because I love sailing upwind best. So my biased advice would be to get lots of monohull time (a J22 is an excellent choice, so are many others, including the lighter centerboard boats which are more sensitive to trim and body-weight placement). then you can decide if you are willing to give up being able to tack quickly for the extra downwind speed of a cat.
the best sailors, I think, come out of the small boats (e.g. Sunfish, Laser, Vanguard 15, 420), 'cause they're less forgiving of mistakes so the feedback is immediate rather than delayed or not apparent at all. these skills transfer well up to the slower inertia of the larger heavier boats. Vice-versa, not so much....
Good luck anyway, you're learning and asking questions, that's all good.