Fast forward a some years and now I'm making a good living doing that for a supplement company.

Very good supplemental reading to Hill's book.

I get lots of such supplemental property tax bills.  

I am interested, as of right now, in either single family or multifamily investing.Currently my basic real estate investing goals are meager, supplement my current salary with passive income from rentals.

I hope to acquire enough properties to supplement enough pay in rental income to leave my job to pursue flipping options or further rental possibilities.

Is there anything I can do right now or within a year to supplement my income to leave my job?

My main goal is to supplement my retirement income with $5K in passive income.  

There is a ton of supplemental resources on the website to help you with your first few flips.

The income from the properties would initially be used a a supplement to my income but I would eventually like to have real estate become my primary source of income.  

For example, taking 100 acres and making a city, how cool would that be.The good thing about REI is, its flexible and you can do it as a supplement to whatever your doing now or plan to do.I say do both, maybe use your RE license to fund your education in architecture.I agree wholeheartedly with @Ryan Koehler , especially if one is independent.