It's crucial to conduct thorough research, consult with local professionals, and be prepared for unexpected expenses.If you're uncertain about specific local regulations or tax implications, consider consulting with a real estate professional, accountant, or attorney who can provide guidance based on your unique situation and the local market conditions.

Quote from @Kathleen Dylan: You are in the most litigious, regulated corner of the world.

I know it is difficult to ask specific questions when you are trying to figure out where to start, but tough to give advice about securities regulations on a public forum especially when the questions are open ended. 

.: The regulations in the area are pretty lax.

@Katlynn Teague You do NOT have to use the state-regulated form...

The requirements, costs and regulation is different in every state.

I want the concept plan to illustrate hypothetical lot layouts with different zoning regulations such as R20, R30, R40, PUD, or special use.

My default position has always been, "No one will take better care of your property than you".However, here's a list of issues that can force you into using a PM:Out of State - non local propertiesRE inventory that requires too much of your personal timeSpecific properties with a unit count that then require onsite managerIn Calif, (3) the count is 16 or more units, and if you hire a manager, then you have to follow all the employer regulations, which easily adds 35% above the salary. 

But to get you started, a few inexpensive items you can implement to improve the park quickly - create good rules and regulations for the park and enforce the "No Pay, No Stay" policy; improve the road frontage with a white 3 rail fence and new sign; do not allow dangerous breed dogs.After that, find the money for MHU Boot Camp and attend :)

If you are starting out with rental houses, get ready for more impossible rules and regulations and higher costs for repairs.