coconanipoo
Hello & Welcome to the Forum!
Sadly you find yourself in a position that many do when a relative passes and leaves a train collection behind.
Here is a link created by Mr Muffins Trains to help those seeking buyers for collections.
https://mrmuffinstrains.com/pages/selling-your-trainKeep in mind you won't rceive top dollar/auction/retail prices unless you take the time to sell each piece individually/privately.
Happy Rails!
dave