Robert,
NOO is non owner occupied - meaning investment properties only
Yes the percentages are the interest rate and interest only
A point or in this case 3-6% is the origination. 1 point is 1% of the loan amount, for a 100,000 loan a point is $1,000. So 3 to 6 point is $3,000 to $6,000
When a lender states the % or ARV they lend that is the amount of the deal they will lend you. If the house is worth $100,000 after repaired, the lender in this case will lend 65% or $65,000. Your goal is to have your deal, purchase, repairs and closing costs total as close to that 65% as possible to limit your capital into the deal.
Underwrite is the process used to make a decision on if the lender will find the deal. In this case the lender states that the asset or property is more important than say credit or income.
The finding fee- hard to say of it is high or not, really depends on the market. It is just a junk fee, meaning it is used to create more income for the lender.
Good luck!