I generally aim for about 6 per hour of shooting. One or two finished, fully edited photos per "look."
If shooting an experienced model, consider showing low-res, batch-edited proofs so the model can help you choose which ones are the best. Throw away all your duplicates, out-of-focus, and just plan "bad" ones; then do some simple batch edits (white balance, sharpness, etc); send the model the low-res, proof-watermarked proofs (maybe 20 per hour) with your recommendations of which ones to keep. Then do full edits on the keepers.
As far as skin editing, do a search on Youtube for Cameron Rad's "A Perfect Lie Tutorial." You very rarely get desirable results when using a simple gaussian blur to clean up skin - it'll look plastic and fake.
Also: PPI/DPI doesn't matter unless you're printing. If the file never leaves the computer screen, the DPI field in the file is meaningless.