@Brenda Rogers Congratulations on your new vacation rental condo! I love working with vacation rentals! I have three in Fort Walton Beach, FL. They have been very lucrative for me. I also provide rental assistance, listing set up assistance and consulting to vacation rental owners who manage their property on their own. Feel free to ask me any questions, etc. You can message me if you like and I'll give you my phone number if you would like to call me with questions.
I use VRBO and Airbnb. I would be more than happy to tell you about my experience with both of these. I have tried TripAdvisor and did not like it. I am currently considering trying out Emerald Coast by Owner, but I really don't know that I need it.
As for the fee on VRBO. I believe that it's "either/or". Either the $499 flat annual fee OR the 3% pay as you go. I'm not sure why the VRBO rep told you to pay both.
I know that some people use Craigslist to market vacation rentals. Perhaps for some type of properties that is ok. For me and the kind of rentals I have it is absolutely not the right venue to market. I'm also very leery of the numerous cases of fraud, etc on Craigslist.
I also take some "direct bookings" from repeat/loyal guests or people that I know personally. I definitely have everyone sign a rental agreement via electronic signature.
I hope your rental is very successful. Keep us posted.