Recommendations on appropriate drill for drilling into concrete floor
I personally use powder-driven fasteners for interior bottom plates that aren't part of a structural hold-down transfer path. You can pick up a hammer-blow nail gun for around $20 and shoot hardened nails with washers into your plates with less effort than drilling holes, cleaning them out, and fastening with screws. Some construction adhesive and nails will hold your walls fine. A hammer drill is okay, but a "rotary hammer" is best if you're going to rent something to drill a bunch of holes in cured concrete. H.D. tool rental carries them in a range of sizes and you can rent it for as little as 4-hours.