Was it simply experience, or were there particular resources that were helpful to you? 

BP is still the best place to go for free education and resources.

Bigger Pockets is a great place for education and networking and is full of great content.I recommend that you check out the following resources:1.

With wholesaling, marketing budget is key, but also persistance and having the tools/resources to do it well. 

Not sure what the rules/resources are for Travis County and the surrounding cities. 

Not sure what state you intend to get licensed in to start, but before you get too far along I would check with the Real Estate Commission to confirm that your end-game (AI decisions only, no human broker in the loop) will pass their muster.

I'm hoping you guys know some resources I don't Alternatively, does anyone have suggestions for a good insurance broker in Baltimore, MD? 

BiggerPockets is full of resources designed to help you along your journey, whether you are just getting started or a seasoned investor.

Without coaches, without gurus, without any other resources, they simply saved some money, bought a property, managed it as best they could, and held it for 30+ years. 

@Vin Gupta Shawn is right and he's probably one of your best resources on BP for the Orlando area.