Look up local investors on social media and follow them and comment and like their posts so they get used to seeing your name.

If it's posted in Florida MLS, it's available in all online sites and people who are looking to buy property in your area can find your listings. 

I put supplies on the job site.

I'm with Dan on this one. 1.

Yes, operations is a big part of that, especially for anyone that wants to be a business for the long-term.If I were you, I would be talking to office brokers about partnering more than an online forum.   

For mobile homes, it often depends on whether the property is considered real estate (attached to land) or personal property (if it’s not).

I would never form an entity with them when I can do it online with a firm that charges a fraction of what they charge).

Here is a recent bulletin from PSI with more information on the exam & requirements for becoming a broker. 

I do SMS, cold call, mail, online, wholesalers, etc.

Surprising you can get a heloc on an investment property - those are tough.