You want to be a brake tech? As a *retired* (career change due to accident) mechanic, I like brakes but doing brakes only wouldn't pay the bills... And it would get old quick!
For tools, you would need a couple of things for drum springs and adjusters, I think I have 4pc from SnapOn for that, and otherwise just standard mechanics tools. Metric and standard sockets, wrenches, and flare nuts.