I would look online and then supplement your knowledge with specific questions here on BP.  

If you're looking to supplement/replace your income, this strategy obviously won't work.

I've got a list of the expenses the owner pays vs the tenants (and will verify during due diligence) so that's also all in the expense calculation and unless he's not truthful we're covered there.I do like assuming a discounted NOI for the first few years too to create a buffer for the bad things happening.I'm going to try to put down as little as realistically possible aiming for about 10% so maybe a 75/15/10 with the seller carrying 15% and I'm getting a couple quotes for the commercial loan this week, one from my latest broker and another from a community bank that I've dealt with once before.Hope that all makes sense.Agreed, @David Lichtenstadter and @Watson Smith, I don't want to do this deal at $0 cash flow because it's too thin and risky and I'm looking for a deal that will cash flow (to supplement my existing properties that are structured as long-term holds).

As such you need to evaluate your risk threshold and the income/equity you should protect and see if you need to supplement with asset protection strategies (entities, trusts, LLC, etc).LLC is used for liability protection - insurance against litigation. 

I don’t consider future appreciation much my reason for buying rental properties is to supplement my retirement income, so that means it has to cashflow generously which means the 1% rule or better. 

I currently have a one rental property in the Bay Area and I am looking for other ways to supplement my salary from my full time job. 

It can absolutely be tough to purchase a house in such an expensive market so you'll need to weigh the costs of the money you're paying to rent a place and not be tied to it or responsible for keeping the place up vs. buying an investment property to live in and use rent to supplement your income while taking on the responsibility of managing a house. 

Might help you supplement for the time being.

So I lay in a supply for supplemental use at the start of December.

I want it to replace or at least supplement my 9-5 job, and then keep growing from there as I did before.I'm currently in SouthEastern PA, but the market here is pretty wild, so I'm thinking of exploring other places and delegating the bulk of the work like management, etc.