So talking to people who have actually worked with them is important. 

Getting the best interest rates, doing (re-)taxations, changing the percentage for a down payments that needs to be paid or for the % in refinancing to get back.We are actually planning our next meet up in Barcelona about refinancing where a mortgage broker is coming to have a talk.

Then learning how to operator with other people's money at risk, and only truly learning to underwrite once they have been operating and learning with OPM at risk.While I like all your items (although the Analyst, in my opinion, should be part of either the deal finder or operator piece), I would reorder them:1.

If you have more than $500K of gain (and you both qualify) or if you have more than $250K of gain and only you qualify then you could actually sell and take both the primary residence exemption. 

Yes actually.

DSCR loans won't use your income to underwrite the loan.DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.Here's a bit more in detail about how rates are calculated for DSCR loans:1.

And our ROI is actually much better with SFRs.

I'd offer different packages, such as purchasing furniture and supplies, doing actual set-up, refreshing an already-furnished rental, doing marketing, etc.

If you're dead set on investing in the area, then I would try to partner up with other investors to see if it's worth it, otherwise take a look into OOS investing in a state like Ohio where the numbers and landlord laws actually make sense. 

How will you know if the letter is from the actual landlord?