Regarding getting started, I recommend finding an STR owner who's overwhelmed or just worn out with managing their property, and perhaps who's also not using a dynamic pricing tool, and then offering to manage it for a very small cost. 

Thought I could set up an SDIRA and use this to get started.

Start with BiggerPockets Ultimate Beginners Guide (free).

I have never attempted to make a seller financing or any creative financing offer before so I am trying to get a starting point.Thank you!

You can start by not calling us Boomers, lol.

Some investors also use a business line of credit backed by their cash flow, which can help with future deals.If you’re planning to scale, maybe start stacking that cash for the next property or even park some in T-bills for short-term returns.

I got my license as an agent and have done a lot to learn as much as possible about the market I'm in and the real estate world in general.I am working with one investor currently, building a plan to start spec building in the new year, with a few other ideas as well.I'm excited to meet like minded people on this forum!

I would start by looking at Ohio.

Currently started renting it for 2300$ per month , need your suggestion things I can do to fix my below situation. 

Would it be best to start an LLC or sCorp in CA and deal with the astronomical annual fees?