Buy good quality tools - they'll pay for themselves & give you the satisfaction of working on your own bike.
for info, try:
http://www.parktool.com/repair/byregion.asp for some good, no-nonsense information.
or try:
http://www.bbinstitute.com/manual.htm and scroll to the bottom for some free pdf files from their manual. It's pretty comprehensive: 54 pages on disk brakes, 14 pages on bottom brackets.