Buy a toolbox. Then, buy a tool at a time as you need them. Fill up your toolbox in due time. Here are some basic tools I've acquired over the years: screwdrivers, hammers, mallets, wrenches, Allen wrenches, socket wrenches, pliers, needle nose pliers, tweezers, corded drill, drill bits, duct tape, ruler, electrical tape, measuring tape, epoxy, super glue, leveler.

You could also buy a large set of tools. However, keep in mind you WILL have to deal with lost/misplaced/stolen tools. If you buy a large set of tools, replacing tools can be annoying because you'll have to break the original set. In contrast, if you buy tools individually from the beginning, replacing tools will be uneventful.