The sore fingers will go away and your hand gets tougher - sort of like learning to play a guitar - a small wire or string across your fingers, especially with a lot of pressure just isn't "normal." They have to be trained to it.
Whether you use a tab or a glove or shoot split or 3 under is pretty much a personal preference issue. I shoot 3 under because I'm more accurate that way. Some bows seem noisier 3 under and some don't. I prefer a glove, but that really have more to do with it being harder to lose once I fasten the strap around my wrist than any inherent advantage of gloves.
As for practice, Ferret and the others are right. Too much is not a good thing. You start getting tired and sloppy and then your muscles are learning sloppy habits.
Do some form practice, about 5 yards back from something you can't miss and pay no attention to where you hit, just make sure your draw and release are smooth and consistent. When you're going for accuracy, shoot a group or two to warm up and then start shooting single arrows. Concentrate on each shot, and then either go get your arrow, or at least move to different place, and take another good shot. After about 1/2 hour, quit until tomorrow.
And above all else, have fun. If you find you're out there shooting and it's not fun, hang it up for the day and come back tomorrow. A wise man once told me that shooting instinctively has some resemblance to teaching pigs to sing - somedays you go out and all you're doing is frustrating yourself and annoying the pigs; other days, those porkers are out there in perfect four part harmony and the shooting session is pure joy. Never lose the fun.