This kind of work is not for every one the yards are not close together maybe 20 mins to a hour sometimes you get lucky and get a bunch within 10 mins of each other.   
On graigslist look under all gigs. 
Or go to safeguard properties .com 
And sign up as a vender. 
A2z field services. 
If you was close to me I would give you more yards than you could handle.  
I start guys out at 10 yards a week then give them more as they get faster.   I pay $40 a yard 
You have to take anywhere from 15 to 30 pics per yard depends on if it is bank owned or a HUD home.  
You can look up property preservation and find a lot of company's that hire subs.
(( racing is the only sport that you need two balls ))