I have looked around online, but haven't had any luck yet, i have local real estate agent there, but they are not expertised on those distressed properties.  

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

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.

As a wholesaler, hopefully hearing from some of you with experience with these sites, what are the advantages or disadvantages of each of these sites respectively... as far as which search criteria to use on each platform?

Listing your properties on platforms like LoopNet or Crexi can be worth it!

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!

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

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.

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