I am currently 18 and just trying to get all the information straight and trying to understand it all.

Are you taking equity out of your first rental or going straight cash?

Hi @Jonathan Schwartz,In this case, going straight to a lawyer would likely be best.

The alternative is to work until I am 50 or 55 and invest that $100k passive income into other investment avenues to setup even further success while still making good money in corporate America.Those were pretty long winded examples to basically get across my question of do you have any good methods for how many of these methods/strategies break the boundary of straight investing to actually becoming primary income for the investor.

I had tons of tools and material at my last BRR for 6 weeks straight and was very fortunate. 

I recommend going straight to the listing agent of the property that you are interested in.

. $10-30K) are you using the BRRRR method or are these just straight cash investments.

@Michael Vaughn I would add if you are new to note investing Joshua Andrews wrote a book called "Paper Profits" that is worth reading to provide some basic to intermediate level info on note investing and also provides examples of how to calculate yield within the book but more straight forward language that the threaded discussion referenced.   

Is it typical to give just a straight ROI or a % of equity or both and for how long would they get equity? 

At worst you buy something without a great cap rate or cash return and hope fore appreciation, but with rents already high and new construction popping up in multiple parts of the city (Southie/Charlestown/Southendish) I think you would want to be very careful making a straight appreciation play in those parts.