A decent tool kit with all the tools needed will cost you anything from 500 to a grand to buy new tools (and they are middle brands, not Snap On (off)). Draper basic sockets are crap, etc. You want tools that will last the heavy duty jobs they will be doing. EBay might help. You will also need pneumatic tools as not many MROs supply them (mine does, but that is rare!) There will be many ways to solve problems with tasks that you will never have come across, the experienced mechanic will know them. I fear you will be wasting your money with an HF FTS cert, pride doesn't get you the knowledge you will need to start..
BTW I'm a basic AML holding Mechanic at a base MRO, with over two decades involved with military aviation and 3 years base experience on narrow bodies.. Not as much experience as others that frequent this forum but I know a little.