I would like to purchase long-term rentals (ideally in the Denver metro where I live) but am not sure what, if any, cash flow I could achieve. 

Read Beginner’s Guide to help you get started: http://www.biggerpockets.com/real-estate-investingI hope BP helps you achieve your goals!

There is no doubt that REI in Section 8 is risky, but the entry point is attractive with leveraged yields well in excess of what you can achieve in regular REI.  

This is the easiest way to achieve positive cashflow, and there are a fair amount of deals that make sense out there. 

I would suggest probates, liens, bankruptcies, and class B/C/D landlords with vacancies (see if you can find some migration data).

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What is the median income, to make sure you can achieve pro forma rent.

In short, to achieve and maintain financial freedom.

Make sure to connect with local lenders and brokers as well, it will be beneficial for achieving your real estate goals.

As I understand it, the great  CCR and IRR numbers can be achieved (in part) because FIG presells the units and can negotiate harder with builders who can be hired to build multiple buildings instead of just one.