Oceanblue,
Sounds like you've raided my garage roof-space!!!

I started with gear very similar, (actually, nearly exact, ie; 2 bomboras, a race-board, various sails/masts/booms etc.) a bargain for under $300. That was 15 years ago, although I weighed a bit more than you do, I got so annoyed with trying to get the hang of it , I gave up.
13 years later (2 years ago.....for the mathematically challenged), I tried a modern, 'wide-board' 165lt, and got hooked instantly.

I went out and 'invested' in a new setup, (and since have added to it with some good 'pre-loved' equip). I've been a wind-junkie ever since (just ask my wife!!!)
I don't want to put you off, I hope you get going and enjoy it on the gear you bought, if not, get a lesson on some new gear. 13 years is way too long to wait to realise how much fun windsurfing is. If you can, find someone that knows how to rig the gear you have (you'll know them by the grey hairs

), they should give you some pointers on the best ways to get going.