I like the compete tool kits; the ones that come with screwdrivers, wrenches, tape measure, pliers and wrenches. Everyone should have them, I can get them for $20 on sale.
Floating shelves do not require a power drill when installed in drywall. The proper technique is to install Drywall anchors (with a screwdriver, takes about 10 seconds) then the screw (30 seconds). If its in the stud, which is stronger but limits placement, you should drill a pilot hole (can be done with a push drill, again no power drill required) then use a screwdriver. The basic tools I need all fit into a shoebox.
Watch Youtube videos on Push Drills, they'll do exactly what you desire.
I have a house (lots of space) and a drill, I still like my basic hand tools. Sometimes the simple solutions are best, especially for rare use situations or when you just need something for a minute and the battery is dead or you don't feel like dragging out extension cords. You can pass the tools onto your grandkids, they'll never wear out or require a new battery. Large scale projects are easier with power tools, what you described is small scale projects and there's a world of difference.