Find a local Motorcycle Safety Foundation class and take it. Do that first. Get your endorsement (in many states, passing the class waives the DOL test and you just pay your endorsement fee). THEN do your bike shopping. I didn’t do it that way (I got the bike first), and though a year plus (and over 6000 miles) down the road I’m comfortable on my bike, coming out of the class I probably would have picked a different one.
I don’t think the Rebel will be overcome by the hills, but you may find it small for your height. No way to know until you sit on one.