Can anyone help me out on what the best and worst States are for non-performing and performing notes? 

@Dan FisherIf you perform full-time or part-time self-employment activity consider opening a self-employed solo 401(k) which will allow you to self direct your funds into real estate.

For now, we rather bet on housing than stocks.Here's the dilemma.

The investment is quite different than the REITs from Rich Uncles, RealtyMogul, and Fundrise (AHP buys non-performing mortgages in bulk at a discount), but the minimum is lower ($100) and they offer "best efforts" redemption to get your money out within 30 days if you need it (you take a slight hit on the return rate if it's earlier than 12 months IIRC -- 10% or 11% instead of 12%, but still a relatively flexible program).

I would say Keller Williams or Baird and Warner may be your best bet. 

With what little info you've provided, I'm willing to bet you could cash out for a bit more than that.

I'll bet you get experience real fast with 300 units to maintain! 

Per the lease if it stipulates the landlord has a right to enter the premises with proper notice to perform an inspection of the unit then it's valid.A tenant with a lease cannot keep denying a landlord entry into the property for inspection.

What has been your experience with having a tenant perform yard work/snow shoveling and minor repairs?     

I have been jammed by present-landlord lies - likely to expedite them dumping their poorly performing tenant onto my plate.