I am now a professional licensed engineer and I am also able to do real estate and investing on the side to supplement my income. 

Find a bank that has a higher limit or supplement some of your own money. 

I am 64 and need to supplement my retirement and believe REI is the best way I can do that....I want to start by buying houses from motivated sellers who want out quickly, such as a possible foreclosure situations.   

Even with a live-in hack, the money you're paying in is (a) Building your equity in the home, and, (b) If you're renovating while living in, you'll get the tax benefits, as well as the force appreciation, more equity for you.Eventually you can rent it out for a stable cash flow and refinance on the original home to utilize for your next property.Or, you can always entertain the idea of a MFH (less than four units) - you live in one, and use the potential income to supplement qualifying for a mortgage.These are very loosely-given suggestions, and your due-diligence is of the utmost importance.

I am looking to work in finance/banking for 2-3 years and save up as much money as I can as I pursue my REI dream.I really wanted to either get my salespersons license or brokers license to supplement my income on a part-time basis and for me to get to know the industry better + build connections. 

I'm a looking at making a purchase in the Inglewood, CA area and hoping to supplement with rental income - either getting a roommate in a SFH or acquiring a multi unit property.

I'm essentially coming from square 1.I'm later in my career, and am currently thinking of notes in terms of providing diversity in my portfolio, supplemental income, and providing better returns than the market.   

I don't want a bunch of rental properties, just enough to nicely supplement my other income.

Is this a one off thing for them, or are they looking to supplement their monthly income from the interest payments you're making them.

Books, blogs and webinars should only supplement real world application.