Read Roses for Dummies, it was the first book I picked up when I started growing them and the writers really put it in normal terms so it's easy to understand roses. J&P are good roses but I've branched out lately too, as J&P were getting to where they'd ship me smaller and smaller ones and they weren't doing as well.
I'll throw in that I also use Orthenex spray as well as Mills magic Rose Fertilizer. It's the stinkiest stuff in the world (it's dark green and looks like pond sludge, smells like dead fish water LOL), but it really makes them grow and produce beautiful blooms.
Research disease resistant varieties for your area too, as what grows in zone 7 might not do so well in another area....etc. And start small, taking care of one or two and working your way up from there will be a lot easier than starting out with trying to prune, weed, spray, fertilize and water 25 LOL