Don't take this advice too personally (you already have a background in windsurfing), but I often see new people getting into, or back into the sport, who just refuse to spend any money to get appropriate gear. When I see this, I like to pass on this quote from a long-time windsurfing instructor (and guy who really wants to see people thrive in this sport):
This sport has a terrible reputation for being difficult to learn and a L O N G learning curve just to get to enter the intermediate stage -- harness and footstraps on a plane -- but much of that rep is due to a culture that believe no money should ever be spent on this sport and no equipment should ever be retired. It's pretty amazing. No other sport seems to have this problem. I've yet to come across a friend on the first tee trying to play golf with hickory shafts that, yes, Ben Hogan won the US Open with and, yes, my grandfather learned to play golf quite well on -- and there are tons of those clubs at yard sales, but we all seem to understand they are sold as antique collector items, not to actually use!! But, lord have mercy, in windsurfing I get calls constantly from people who have just bought -- yes, paid money -- for a one-piece aluminum mass with tie-on booms and mast base/extension device i can't even describe here. And the sail weighs more than the board! (And, although, no one around here would never do it, it's disturbing it is experienced windsurfers who sold this stuff to a beginner, because, after all, "didn't I once break 90 with hickory shafts way back in the day when I learned the game . It can be done. You can too!")
This. Plus down our way I see people buying old gear and they aren't buying fun, they are buying frustration. There are very few beginner boards like the old days - boards you bought to use for 6 months and then sold because they were dogs in real conditions and thank heavens for that. Starting with the Starboard Go, there are all sorts of boards that are beginner friendly and by using a longer fin and moving the straps perform quite admirably. Starboard Gos, big Carves, larger JPs, Bics, etc are all very accessible because of their width and volume yet are a blast to use on a breezy day for someone who's windsurfed for years.
You may have to drive or have something shipped to you because they are rare in the SE but they do pop up from time to time.
One of my favorite boards in the stable is a *board Freeformula 156 which rips with an 8.0 and a 50cm fin. It's just a wooden construction Go from it's era, circa 2004. Someone who's barely windsurfed (and not too big) can easily take this board out and use it (82cm wide).
This goes for sails. You can collect a bunch of cammed sails from 1995 and assemble some sort of quiver which is temperamental and limited in range. Or, you can find 2 modern Ezzys, a 7.5 and 6.0 that will cover you up to and over 30 mph.
I know it's tempting to think it can be done on the cheap. In all honesty, it can but you are making it much harder on yourself than it needs to be. And, if you decide it really wasn't for you, this stuff actually has resale value
Good luck and welcome back.