If this is the case, would the original seller financing have to mention that the buyer (me) can re-sell the property at any time? 

Well, that’s definitely something to write home about. :-)You use the word “WE” a lot.

Keep in mind these cities become hot because of past data, not future.

I want to know if there is anything I can do right now that will help me in becoming a realtor in the future.

This would apply to your unit.Your biggest concern with setting the rent should be the near future. 1) Your insurance is guaranteed to go up, probably dramatically.  2) You may get an insurance assessment bill to cover the CA Fair Plan losses.

Without the high leverage you reduce the top source of return in CA RE which is achieve via the appreciation on a high leverage property.  

I'm hopeful we can find more productive ways with less red tape in the future outside of LIHTC leveraging technology since standard construction really could use an overhaul.  

-Creates a solid foundation for passive income, allowing you to reinvest future cash flow into other opportunities without as much financial risk.Cons:-Ties up a large amount of capital that could potentially be used to generate higher returns elsewhere (like another STR or other investments).

Given that the seller is financing the deal for the 2 years and then the plan is to re-finance it with a bank, I am having difficulty producing such financial analysis.

Find some areas you want to be and then look at the RE markets.