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Yes, using water when drilling concrete can help keep dust from clogging the hole and prevent your drill bit from wearing out, although you don’t need to spray water on the concrete while drilling. Water can also lubricate the bit and help keep it cool since drilling into concrete can generate a lot of friction and heat. 

Both concrete and asphalt are appropriate for your driveway apron. The choice often comes down to local laws and the current material of your driveway. In some cases, your town may require you to install wire mesh or rebar to fortify the material, but both are common in apron installation.

No, you cannot drive on concrete after three days because it has not cured enough to support the weight of a vehicle. Doing so will likely leave tire track imprints on the concrete surface and reduce its long-term strength. It is best to wait at least seven days before driving on concrete.

Generally speaking, stain is a better option for concrete because it soaks into the surface and won’t get worn away like a topical paint will. Painting concrete increases the risk that moisture will get trapped beneath the top layer of paint, which wears concrete down over time. So long as you know how to prep concrete for staining, you'll maintain its strength after you finish your project.