BiggerPockets is an awesome online community for anyone interested in real estate investing.

If you know of any online forums or organizations where I can learn from others and expand my network and knowledge on wholesaling or getting my first deal, I’d really appreciate any recommendations Thanks in advance for your help!

Quote from @Stuart Udis: Unfortunately there's a ton of online content teaching novice investors that reaching XYZ number of doors equates to financial independence.

is there a way for me to create an online STR guestbook for free? 

You can find them through local real estate investment groups or online platforms.Auction or Estate Sale: If the property has unique characteristics, especially being a large, old Victorian, it might attract specific buyers looking for such properties.

Look at other rentals in the area and see not only how they are advertising or promoting online but also the inside and outside of the rental so you can create a similar environment to try to replicate the same results.

He has no social media, no pictures, no videos, no online presence, nothing.

Then I'll focus on paying off mortgages and making my investments "safe" instead of focusing on growth.

You can also check their reviews online at Google, Facebook, or Yelp.

To managed it a bit easier (when you grow to more than a dozen), it'll be better to have one online login and manage all 'child' accounts.