You will be hired to do a job. Know and understand exactly what is expected of you performing your job. Hours, duties, breaks, etc. just like any other job. Ask enough questions so that you know exactly what you will be doing and what you are not supposed to do.
You will be paid for doing that job. The pay will probably be a campsite. What else will you get? Free laundry, free propane, free wifi, etc. Know exactly what you will receive for the hours you work.
Understand what exactly you will receive for any hours you work over the agreed hours.
Decide what is important to you at your campsite and are they even available or provided as part of your pay. Do you have to have cable TV, laundry, propane, full hook up or just water and electric? Do you need 50 amp or will 30 amp do?
Do you have pets? Is your job site walking distance from the RV site?
A successful work camper experience requires the work camper to know exactly what he or she needs and wants for the work required, and the RV park operator have clear expectations of the extent of work the work camper will do for the benefits offered.
Everything in writing prevents misunderstandings.