Also make sure that the tenants pay for there own utilities 

They typically want 2 years worth of tax returns (done by a CPA makes life easier), and will want bank statements for all accounts.

I still look at everything after the fact and typically most all if not all your Cap Ex is completed after the rehab is done.  

We utilize an efficient method that allows us to build homes very cost effectively while producing less waste and reducing our carbon footprint.

Generate your own leads and then you have lots less competition and if you do have competition it's other investors and typically not first timers shopping with their agent.

Is haveing a COC return of around those numbers pretty typical in Katy in the market we are in? 

3 x 2 BR Apartments @ $700-$750/mo.1 x 1 BR Apartments @ $550/mo.4 x Studio Apartments @ $400-450/mo.Commercial is 1450 sq. ft. and should rent at $11-12/ft.All units have completely separate utilities, except water.  

That typically is investors.

How much would that typically run?

@Ray P.Be careful with phrases like "promissory note to myself" relative to using a SD IRA...typically you cannot directly benefit personally when using a SDIRA, all transactions have to be done in the IRAs name.With 15 K, I would probably:- Leave it, invest it as best you could with stocks.