Thank you @Travis Sperr and @Adam Kroll. I'd like to pick your brains further if you don't mind. Regarding risk tolerance... would you say there is greater risk purchasing fewer properties with more money down (less to finance) rather than with minimal down payments? Let's say this would apply to either rental property or flipping. Of course with more money down, fewer properties can be bought. This doesn't seem to make sense with buy and hold as it ties up a lot of money for a long period of time with fewer properties to be obtained, even if the cash flow would be enhanced. After having mortgages on 6 houses for nearly 40 years (we moved a lot) and always dreaming of the day that one would be paid off, it is mind boggling to imagine holding 5 or 10 mortgages (or more) that won't be paid off for another 30 years as we are nearing retirement! I imagine that younger folks don't suffer as much from this anxiety. But I'm willing to do this if the numbers show that this DOES make sense. That being said, a little cash flow would be nice especially in about 5 years when we would consider retirement from 9-5 employment. Another means to that end might be light flips and then hold if the right property becomes available?
Another question - are people having success with short term rentals? VRBO? (I'm guessing most VRBOs are in the mountains). Traveling nurses, etc.
It's good to know that cash flow is workable in the Denver area. I do see, however, that good deals on properties aren't plentiful across the region according to the MLS. The art of finding the deal will need to be developed to improve outcomes.
As far as willingness to work - I am by nature a workaholic. Currently I devote many hours a day to researching, analyzing, and listening to BP podcasts. I find it kind of fun and interesting. I intend for this to be my "full-time job" (at least by REI standards), with my secondary job being an artist which pays next to nothing. Meanwhile, my spouse is hanging onto a full-time job so we can afford to take some chances with this endeavor.
Regarding the ability to obtain financing - time will tell, of course, so I can't speculate on our ability there. This will be a massive research project in itself.
Finally, goals are dual - a bit of cash flow but with the aim of holding on for appreciation until a time when either the market says "Sell now" or retirement accounts begin to dwindle. Alternatively, we pass the properties on to our 2 grown children.
Thanks again for your time and input.