welcome to the world of windsurfing firstly. Now as for boards: there are in the SB catalogue quite a few options to choose from HOWEVER, you are a complete beginner so it's quite complex. You basicly want to buy something almost all more advanced beginners want: a progression board. But since you've never windsurfed it gets harder. To the others i just yell: get a GO and get going, that board can be really fast (on the free forum there is a thread of a french guy going what was it? 35 knts or something on a GO 122). Your sailing experience will be a good help for you but windsurfing does contain a lot of aspects that differ from regular sailing so i don't know how fast you'll progress.
My recommendation is: take up a few lessons, see how fast you're learning and once you've had your first planning session, go shopping. If you're determined to buy right now i'd suggest the Rio. Not too fast but stable and fun at first. Or perhaps a larger Stat (though i find the starts absolute slugs on the water). The kodes are fun, but not when you're just getting into the sport, they are progression boards and considering hte conditions you'll be sailing in the better choice between the 2 progression boards that SB has to offer (GO and Kode tuffskin).
those are my thoughts of it. I'm sure Roger still has a few thing to add to it. As for rigs: no matter your level: Gaastra pilot. Very simple sails, very usable up to a very decent level (i'm, after 3 years of use, just starting to grow out of my pilot), and in the right wind very responsive. Along with a good 30 % mast and alu boom it makes for a good and economic rig.
have fun sailing (i unfortunatly wont, damn injuries)
Haiko, AKA crazychemical