(Of course you don't need to be a REALTOR - simply an agent will probably suffice) Your best bet is to ally yourself with an appraiser that has access to MLS in the areas you are looking in.

The owners policy will suffice.

For me suffice it to say, this is not a 1% rule, but probably more like the 80/20 rule where 20% of the (insert wholesaler/realtor/salesperson) make 80% of the $$, in there given field.I am sure there are no stats on what the avg. wholesaler makes, but the avg.

Since I just recently bought the house, they said that the settlement sheet would suffice for the proof of paid taxes.They also said, and I quote, "Since you just bought the house, we're going to have to use the purchase price as the number".

in most states, transfer of real property (real estate) can only be done with a written contract. an email would not suffice.

A sales agent license will not suffice.

You just need a reasonable estimate of value and good comps will suffice.

Medium quality would suffice.

--Continue working for another 10 years, paying off the 300K on the HELOC as quickly as possible, and then buy another property, and start all over, possibly purchasing future properties out of state where 300K would suffice to make a positive cash flow.  

As long as the note payment are made on time, then come tax time, the amortization schedule, together with the bank statements, should suffice as proof for the tax deduction (to help calculate on the Interest Payment).