I walk dogs for people in all kinds of situations.  I've walked for a family who the mom went back to work (she was a doctor) and dad worked from home and couldn't take the time to pack up the baby plus the other child and walk the dog.  So, I'd go twice a week there. 
 
I have quite a few clients who work from home and are there when I pick up the dogs but just don't have the time to stop and walk and play with the dogs mid day. 
 
I charge $16 per visit which is pretty competitive with the country right now, you most likely will be looking at anywhere from $15-17 per walk.  I don't have package deals but some do. 
 
The NAPPS website is also a good reference to get some names from or check out names your vet gives you.  This is the organization most sitters tend to want to be involved with and also is very professional.