I'm thinking of a 3 bedroom, 1 bathroom, with around 1,200 square feet.

I’ve been in a great deal of them for work :) there may be a few extra square feet I could manipulate to squeeze something in on the first floor but the last time I checked my layout it wouldn’t work out with a first floor bath.

Hi all - What does the “ramping process” look like for a loan officer in WA?

I don't disagree but reality is you may have bought a 3500 square foot, 100+ year old brick duplex in crime ridden part of town for $30,000 that would have a reconstruction cost estimate of $390,000 to $450,000. 

You can do a square footage estimate - but that is only an estimate, and probably not a very accurate one until you've got a bunch of experience under your belt.You can line item all the "stuff" - this takes a very long time when you're getting started, and it's probably not very accurate either, especially when you are pricing at the HD, but a lot materials are going to come from a contractors supply (if using licensed contractors), and labor rates vary greatly.You can try to get a GC to come out and give you an idea of cost - but be aware that GC's don't like this, especially when they show up and find "another cheapskate investor trying to slap lipstick on a pig". 

Would like to buy and hold in WA until I have a firm idea on how to build a team out of state.

Could someone help me out and message me the name of a really good re agent who really knows the Hagerstown and Washington County market?

Get to know rents and price per square foot in the areas that interest you.Maybe also check out Mike Butler's book on landlording (I am not affiliated, it is a good read).

If you want interest then at 75k purchase price and $850/month that would be about 13.347% interest on a 30 year amortized owner finance w/ a 2 year balloon.You can use whatever type of owner financing you want but I generally use a Contract for Deed in most cases.

The property is on Renton, WA just south of Seattle.