A simple plan that is 1 to 2 pages will suffice.

A standard purchase and sale agreement with an addendum would suffice.

Assume that $200/unit is average real cash flows (versus what the sellers will claim).  5 Units is $1K/month.  25 units to hit $5K/month which starts to be impactful but likely still a long way from quitting your W2 Job.  50 units for $10K/month and maybe having a real chance to quit your W2 job but probably not seeing that you are living in San Diego.  100 units for $20K/month which may suffice for giving up the W2 jobs. 

@Melvin List - My lender stated that a notice to vacate will suffice.

If they are there more than a year, you definitely have to give them an accounting of it but agreed that the statements should suffice.  

Would a signed quitclaim deed and/or general warranty deed suffice?

In any business you get involved in, simply reading and even listening to pod casts will not suffice. 

This might suffice and the policy MIGHT remain in force.

This will be a simple partnership so I think a properly structured LLC and Operating agreement will suffice.

After that I think every 6 months to a year depending on how you feel about the tenants would suffice should no other issues arise.