My easiest and safest bet would be to just build the outside storage lot.

FB Marketplace is probably your best bet - You can try craigslist too but at least with FB you can do a quick scan of someone's profile before talking to them. 

I’ve educated myself with books like Rich Dad Poor Dad and real estate podcasts, and I know I’ll succeed.I’d love advice from others who’ve been in my shoes: Is it okay to start investing in a different area if one strategy isn’t working?

While doing an Airbnb seems like a good idea it does not resolve the issue of the divorce and splitting the propertyI still think your best bet is to drop the price and sell it and start your life over.

Anything else is in poor taste in my opinion.

15 acres for a lot sounds huge to me and I'll bet you could be missing out on some extra $ by not getting more lots.

I come from a poor upbringing and don't really have family members that have any money.

I was pizz-poor, totally clueless on how to find a deal so I just did what I could, knock doors and ask. 

I second what Jonathan Greene is saying here—turnkey is probably best bet given your constraints.

In fact, if your tenant does poorly, it may put you in a situation where selling is the best option and you will be stuck using the agent that caused the problem in the first place!