I am what is known as a guitar tech, firstly you dont need too many tools to get going, just enough stuff to be able to take guitars to pieces and be able to put them back together. The best way to get into it is to take all your guitars and other thing to bits and find out how the work, use mates guitar if they let you! I wouldnt say being a tech is a job you are likely to make alot of money with, its difficult to make money because you need to fix a lot of guitars per week to make anything, People seem generally shocked at the prices of some repairs and don't realise how much time goes into a fret dressing or big rewire job. Buy a couple of El cheapo guitars and make them play as good as possible, forget about learn things like refinishing and building to start with most of your time will be taken up by new pickups installs and general setups, get good at all that stuff first. There is a few Dan Erlewine books that you also buy too.
Good Luck