Lots of people have interpretated the complicated/detailed mathematics of general relativity so you can read those expert interpretations instead of studying all the precise math to get started.
Here are some sources I've found helpful:
Carroll’s lecture notes:
http://xxx.lanl.gov/abs/gr-qc/9712019
http://www.mathpages.com/rr/rrtoc.htm
http://www.lightandmatter.com/html_books/genrel/
You can also check online for MIT and Caltech lectures.
For some advanced stuff introductions, take a look at some diagrams in wikipedia for Schwarzschild,Kerr and Rindler coordinates/metrics.
Inexpensive books:
An introductory paperback, half special and half general relativity is RELATIVITY SIMPLY EXPLAINED by Martin Gardner...no math, maybe too simple if you have studied special relativity in college.
A paperback book I found useful, and it goes into math in later sections, is Peter Bergmann THEORY OF RELATIVITY...Bergmann was a student of Einstein...and also by him
THE RIDDLE OF GRAVITATION which is excellent...and has a bit on quantum mechanics.
An advanced book is GENERAL RELATIVITY,ASTROPHYSICS AND COSMOLOGY by Raychaudhuri...it's pretty difficult, a graduate level study..all math...too much for me.
finally: read discussions in these forums...keep notes of things that interest you.