Hey Chris, welcome to BP! I'm in Greenville as well i'm a realtor but I also wholesale. I typically send out a email blast to my buyers list and post in a few facebook groups the details of the property I have under contract, and either have 1 or 2 open houses that i have all interested buyers come at once to see the proerpty. This way the owner of the home isn't constantly having to come and go from the property, and i can get all showing's/inspections done in 1 day.
As far as talking to the seller, my policy is transparency. I tell the seller how the process works and I make sure to tell them that I might assign the contract to a fellow investor, in case I can't personally buy the property. (I always try to buy the house myself, but wholesale the ones I won't have time for, or can't line up the money for)
one of my favorite resources for learning more about wholesailing is the "real estate disruptors" podcast with Steve Trang. Tons of good information there. the Local UCREIA (real estate investing club) is doinga virtual meet up next week where a wholesailer from ohio is speaking, you should attend. I think your first meet up is free.
let me know if I can ever help.