Adrian, best way would be to take photo's of the ones you are keen to sell. List them with a price, and just remove as they sell.

I used to have a pretty large collection. Unfortunately, a shelf fell off the wall when I was about 21 odd causing alot of my cars to get damaged. I have a cabinet full of imports (Jada toys) at 1:24 scale, but I have a Shelby Cobra, Mustang, Porcshe 911, VW beetle plus many more at 1:18