Just my opinion but there is no substitute for a hard number from a good contractor, but over time you will be able to gauge this stuff yourself.

And on that note, as a buyer in California, make sure to get a form called "FIRPTA" (Foreign Investment in Real Property Tax Act) or "QS" (Qualified substitute) through escrow to protect yourself from the tax liability!

Buy the MHU due diligence guide if you get serious about the park, there is no substitute for that. 

Zillow is no substitute for extensive  MLS information, so you will have to work will an investor-friendly agent or get your RE agent's license to get access yourself (hence, I'm now taking my pre-license course). 

You can check the county tax records to see where he is in regards to the taxes and you can check the land records and/or court records to see if there is a Notice of Default or Substitution of Trustee filed in regards to foreclosure.

If you've got individual trust deeds against multiple properties and you're able to negotiate a lower interest rate make sure you also negotiate that you are able to substitute the security and subordinate those trust deeds.

My recommendation is to substitute this place instead of FB/IG, and just educate yourself.In the meantime, since you are going to school, stay focused on your grades, and pick a career that you are passionate about, but one that'll generate some capital.As you mature, not only as an aspiring investor, but more so as a a teen going into adulthood, things will develop. 

Honestly, there is no substitute for experience.

He owns a pest control company and I'm a substitute teacher.

Getting free advice on a public forum is no substitute for spending the money with a professional who asks you ALL the right questions and creates a comprehensive picture.