Local REI groups and Facebook marketplace can also be great sources.

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.  

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.

When the date came he said he wasn't going to submit it by the online app (stipulated in the lease) but would have it in cash and that we could come pick it up (we live 3 hours away). 

I mainly want a site that offers advertising the property, online payment options, maintenance requests & at least a basic accounting aspect.Thank you in advance!

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

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!

@Bryon Andrews was spot on in his advice too - do some Zillow and FB Marketplace surfing every few weeks to see what rents in the blocks near your property have been renting for recently, and track how those fluctuate over time for a few months.  

Primarily through Facebook Marketplace, Loopnet and Craigslist.

If you want to put the deposit in a out of state/online bank, then you will have to furnish a bond.