When I was looking at the bike, the previous owner said the battery was old and wouldn't hold a charge, so all I had to do was get a new battery and I would be golden.
So I took it home, got a new battery and was far from golden.

The bike still won't hold a charge, despite a brand new battery. The next thing that I think of is a problem with the charging mechanism. Aparently there are two parts that make up a motorcycle's "alternator:" a stator and a regulator. I am going to take it to the mechanic on friday and have him check it out. I want to use this as an opportunity to learn how to perform maintenance on my bike. How tuff would it be to replace the stator or regulator myself? Should I just let the mechanic do it?
Also I wanted to take it in for a general tune-up, but want to learn how to do this by myself. I have a feeling that the previous owner didn't do any maintenance in the year that he owned it. What do you guys do for "general maintenance?"
Thanks in advance for your help.