First of all, super stoked to see that this'll be your first season and you're so excited about it already. What I would recommend is investing in a beginner package at your resort if they have it, which includes rentals, a lesson, and a day ticket. It's usually discounted and a real good price for beginners. It's always smart to rent your first couple of rounds just to make sure you're really in to snowboarding. I can't tell you how many friends I know who've tried it once or twice, bought a set-up, then decided they didn't like it anymore. Just how it rolls. So yeah renting is the way to go for now, no need to worry about "quality".
I wouldn't worry about "training" before snowboarding. Just staying fit is what's important, and making sure you take your calcium to prevent bone breaks ... lol. Because you'll be on your knees and ass a lot as a beginner. Words of advice: Don't get discouraged after the first day or so. It REALLY is harder than it looks, and it's super frusterating to see people whizzing past you effortlessly while you're still trying to falling leaf. But it's dedication that'll help you get to that point, so keep at it.
Lessons are also real important: Make sure you get in a good lesson where you can really get some good time in with the instructor. If you have the cash, perhaps invest in a personal lesson. I've never had one, but I can imagine how beneficial it must be.
Magnetraction is a new type of edging that Mervin has produced. Most edges are flat and smooth, while magnetraction is kind of seraded and wavy, claiming that it has better edge hold on ice and shit. I've personally never tried it but out here where the groomers are like ice skating rinks, it might work out. I wouldn't worry about it though.
Hope that helped!