I used to do this back in the day and my price was "give me whatever you feel I deserve once I'm done". Boy, did I make a lot of money that summer. I guess people didn't want to end up looking like cheapskates.Actually, I did this for a summer too (I helped people clean out attics and garages as well), and I usually made $40-$80 per job. You could try it out first and then start charging a fixed price if people are screwing you over.
As far as what's expected, mowing, edging, weedwhacking where the mower can't go, and blowing off the driveway/sideway/patio are standard. Don't miss spots, don't leave mowed grass on concrete areas. Ask if they would like it bagged for their compost heap. Also, watch the professional crews and try to model their practice, but do it a bit more conscientiously (avoid chopping flowerbed plants, etc).
Good luck!
posted by Burhanistan at 4:02 PM on October 4, 2009