Do they offer referral codes (kickbacks to you) if you refer me?

You need both an attorney and a CPA to review the offering.

In market like california if someone is offering property for 4000$ . is it possible?

Another idea is on social media, follow a bunch off STR operators and company owners that offer valuable content.

Want all of the things that real estate investing would offer in my life and most importantly want to be my own boss.

They should not be offering you any investment advice at all. 

There's been talk of how these will intersect and it's already happening in some spaces and I'm not talking about Metaverse Real Estate (Although I think some of that will make some people VERY wealthy).I'm talking about real physical real estate providing access to crypto investing and returns, and here's the crazy part...It has the potential to offer all the great things real estate does like depreciation, hedge against inflation and cash flow, all while exposing you to the high reward of Bitcoin's upside and decentralized nature. 

I'm getting a TON of unwanted letters & phone calls for my vacant lot and wonder, since its highly sought after, would building a home first offer more profit. 

There was a tornado in Slidell, LA and I would like to know how to offer my rental house to the insurance companies so that I can house some of their victims. 

Insurance was the first thing to investigate BEFORE making the offer.