2. how to know where to find a B,C,D areas\neighborhoods in cities\ countries.3. how do I know if a property is worth the checking\ buying?

Find me something that's even a 7% cap rate and I'll buy it tomorrow!

@Ofir R.Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

Consequently,  there's rarely enough of a deviation in price between these auctions and what you can buy on the MLS/elsewhere with full diligence capabilities to make these transactions worthwhile. 

Investment Info:Single-family residence buy & hold investment.

Would love some feedback before I make the initial buy in. 

That is like walking into the store to buy juice that is for sale for $5 and paying them $7 for it because you want to pay more than what the juice is worth.

The buy in would be very flexible terms.

I would not buy something right now just to buy something.

I currently live in WA state and invest out of state for buy and holds.