New guy here with a question

Folks,

I have a train set that is rather large from a family estate that I am interested in selling.

I am somewhere in the neighborhood of 200 cars & Engines. Most are 20 - 40 years old and are different brands. A lot of them are Arhearn . I have boxes of track some small buildings.

How would a guy that knows nothing about HO Trains go about selling.

Any advice would be appreciated.

Thanks
Sam