With no monthly payments, interest and loan balance due at six month or pay just interest and a fee to start another six month loan. 6% interest rate I think 

Then if the project sells in 10-months which is not uncommon in my market where permits can take way too long, you pay an addition 4 pts in extension fees.

All things being equal would it be a big factor in stoping someone from buying the house?

I am needing to know that if I get a seller to agree to terms (owner financing) using a purchase and sale agreement, then assign that contract to a tenant buyer with my assignment fee, do I need to be licensed as an agent/broker?

They save a lot of money in annual filing fee's with the state.  

I offered her a one-week close, no inspection contingencies, no loan contingencies, "AS-IS", no closing costs, no fees, no games.

You assign your option for a fee. 

Depending on various factors, I should be able to purchase 2 more properties by next June(2017).  

Obviously one of the main factors is finding investors, and this sounded like a great opportunity.

But if you do have that set of keys, you could save yourself a locksmith's fees in case if any emergency came up.