Re: New to wakeboarding
1. Wakeboarding is very low stress on both the boat and the rider.
I learned behind my brother's Seadoo SP (2 seater, 40hp). We spent several seasons behind a 16' glassmaster with a 115 OB. That boat STRUGGLED to get slalom skiers up. WB is not an issue at all. Grandpa's flat bottom 40hp bass boat would pull wakeboarder w/o a problem.
2. I'm 5'11", 205 and love it. At 230 it just means you need a board on the larger end of the scale. I'd stick to 140cm+, 142-145 preferably.
3. I'd consider any of the entry-intermediate level boards from the reputable brands -- Hyperlite, Liquid Force, CWB -- a few others. Good bindings are critical, and good bindings for a beginner won't be the most expensive. I would look mainly for an easy entry/exit boot. Laces are a bit tedious IMO, but in the beginner boots you'll find a lot of them -- they're fine.
Liquid Force Index boots come to mind. That's what I'm using. Not quite enough support for me, but easy in/out -- a boot I think most beginners would like.
4. Towers are way over-rated IMO. I have one. It's handy, it looks cool and it's a convenient place to store boards. But having the rope up high makes little to no difference your actual riding. It might amount to another inch or two of height once you get to jumping, but for a beginner virtually no improvement.
Just get a good rope with removable sections. Ideal length varies with the boat's wake and your preferred speed, but typically something around 60' works best. It doesn't have to be a NO stretch rope, but LOW stretch would be nice. Wide handles are nice, but not really a factor until you're ready to start learning tricks.
5. Running of any kind -- cardio in general. I consider myself to be in pretty good shape, but when I'm not in "lake" shape all it takes is a minute (literally) of hard riding and I'm winded. This year I've been running a lot and my endurance is greatly improved. Wakeboarding isn't that physically demanding of all the tow sports, but strength in all the obvious areas would be helpful. Back, shoulders, upper leg muscles etc.