I currently have a single family home as my primary and two investment properties.

As someone who is just starting out, I am eager to learn and grow in this field.Experience Level: New to investingGoals: My primary goal is to become a full-time rental property investor.

Starting with a $100K headstart is more than a enough to buy a new primary home. 

After all, platforms like BiggerPockets were started by investors targeting Midwest and Southern markets, where properties are much cheaper, and cash flow is often the primary focus.

There are many reasons that adding a single ADU in southern CA is a less than ideal RE investment (i will post a list at the end) but the negative initial equity is a primary reason as the initial negative equity position consumes the initial cash flow and can take many years to recover.As for converting your home to a rental….

My aim is cash flow not appreciation (as a primary strategy).  

If it is a primary residence it gets resolved fast, however when is an investment property it is a real pain to get them out. 

It would be a primary residence.

Starting out, I would try to take equity from your primary/another property using a HELOC, borrower against a 401k/retirement account, or partner with someone that has cash. 

I'd highly recommend getting a primary residence first or house hacking.