I second what WheelEstate_MS posted. You may also want to look around your area for a Landlord association to join. They have a small charge per year to be a member. They provide advice and refer’s for what ever topic related to renting income property. You can purchase rental forms that comply to your state/county/city landlord tenant laws. Vendors for repairs. Usually a monthly mag.
Renting Mobile homes is the same as renting a stick home. Only difference would be if you are renting just the space/pad and the mobile home it’s self is owned by the occupant. Even if the occupant owns the Mobile they are still tenants. So LL/TT laws would still apply.
Do a google search for keywords of: Example for Long Beach CA.
CA Apartment owners association Long Beach
CA Landlord association Long Beach
Then check them out. See which one fits your needs. Usually they will have a website.
I do both. Check the website first. Then visit in person and if I like it I will join in person. This is not needed. You can do all online if you would rather. This is just what I do.