The average hourly rate for yard work depends on the location and what you're doing or having done for the yard work.
Most average hourly pay for yard work though is between $11.00 per hour to $20.00 per hour but sometimes can be as much as $30.00 per hour for professional landscapers.
So when you're starting out doing lawn care and yard work for people you'll probably be charging $11.00 to $20.00 per hour but when your branch out and get more professional with your work and do more landscaping then you can charge $30.00 and even $50.00 per hour.
You can usually charge businesses more per hour for the landscaping and other yard work than you can charge homeowners.
But some homeowners are pretty wealthy in some places so in those places you can charge more per hour and they'll be willing to pay that hourly rate to keep their lawns looking good.