Hey there, I'm going to speak candidly for a bit.
First. You're far too worried about being a beginner. Your insecurities are your biggest problem. You need to relax, conduct yourself professionally at all times. If you act professional you are professional.
With regards to print pricing I feel it's a very organic process but i'm sure people more involved in the commercial part of selling prints will have a more solid idea.
Now for a point far closer to home. You don't need to get a photography degree, work for peanuts for a big name photographer or sell your soul to get experience. You need some tools, (
strobist,
Morguefile Classroom,
Jasmin's Photoshop Tutorial) and the drive to take pictures.
ALL YOU HAVE TO DO is read a bit, then shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot shoot, then read some more, then edit edit edit edit edit and then shoot shoot shoot shoot shoot shoot. Then do the whole process all over again. (And i typed all of those out, no copy and paste cheating)
You don't need any fancy lenses you don't need any fancy lighting or a fancy camera to start. If you have it, great it gives you tons of room to grow but if not, learn to do the dang best with what you have then once you know you're limited by your gear then move up.
As for backing up, have two external harddrives, both from different manufactures, but of the same size. And manually backup your photos onto each. It's safe secure takes a bit of elbow grease but as long as you keep on top of it you'll be solidly protected.