When I first started with BP I did that, and had an easy Excel sheet you can just input a couple key numbers into and it does the rest.The quick 1% rule will tell you alot: Rental Income divided by Price. 

You will get excellent work from them but pay a premium too.

One has a prior eviction and has been excellent.

Excel entries, pen and paper?

Agreed, value-add investing is an excellent strategy for investors. 

Excellent cashflow from the go.

Excellent cashflow from the go.

For reference i think there was ~60 trusses in that roof, with 7 or 8 having visible burn signs, and we had to replace all the trusses… which means all of the ceiling Sheetrock , attic insulation , sheathing , finish roofing, fascia and soffits… also isn’t there water damage from a fire truck?

For actually sending out letters, input everything into excel, and then use microsoft office's "mail merge" feature to merge the applicable house / contact information into your letters. 

From my previous experience, I can tell you that this same skepticism has also prevented me from excelling.