Sell my Rare Collectables

I am in the process of trying to sell my niche but very rare collectables that I earned in my first year at film school through a company called Goldie marketing. Unfortunately, I am in need of somebody with more experience selling collectables, with a high sellers account on eBay or equivalent? that is willing to help me get the best prices for these items and successfully make a profit. For these prototype toys that were never put into onto the Australian toy market. I currently have the only giant fibreglass hello kitty statue in Australia only one prototype for Australia was ever produced. I have an official signed letter authenticity with the creators signature to go with the statue. I also possess some really unique Mr men figurine test shots that were also licensed by Sanrio in 2004 and created by THQ which mainly licence video games.