Get HML, buy house, rehab, pay the taxes, gain experience.I'd want to use the profit as downpayment on a multiplex with atleast four doors, so having the cash in my bank account isn't necessary.

Higher property values drive rents higher. 

Some will tell you that you need to be "All In" to make it work which I believe is sound advice if you have no responsibilities and plenty of time to door knock, hold open houses; pretty much put your feet on the street. 

Bought my first rental in 2010, got my real estate license in 2013 and bought a property management company in late 2015This is when my life changed and I became exponentially happier.I don’t punch a time clock and I’ll never go back.Since 2015, we have been hovering at around 115-130 doors that we manage for investors, as well as my personal units.Between last year and now, I have personally acquired an additional 10 doors through bank financing and owner financing.Through partnerships I’ve put together a few deals and have a 17 others (two duplexes, one 12 unit apartment, and one condo) .I love the podcast and this community of investors.Thanks,Dave Fulkerson

It's not to say you can't do either, but cash flow can't be the main driver.

I can't get my foot in the door because of the pit vipers that do this 24/7 

. $50k investment, will be listed for over $300k with similar unrenovated property two doors away under contract for $350k as a comp and other recent sales in development at or over $300k.

Here is the Math and how Turnkey works:Average Turnkey Cash Flow Per Door In Phoenix Metro Area No Bank Neededhttps://www.biggerpockets.com/forums/600/topics/584916-average-cash-flow-per-door-in-phoenix-metro-area

Tell any tenant that answers the door that you are an investor and you want to buy the house.

Normally it will take 20 - 30 doors to replace a income, depending on how high the income and cash flow.