You dont have to spend any money on a manual, first go to these sites to find out how to fix things.

http://www.sheldonbrown.com/articles.html

http://www.parktool.com/repair_help/index.shtml

However you will need a spoke wrench and a pair of cone wrenches. This bike will be good for learning how to do all the maintenance, and only buy the tools as you find you need them.