Found - heaps of old trains

Hi, my father recently passed away and after sorting through allot of stuff I stumbled over (N gauge) about 200 coaches, 200 stocks and about 30 locos a ton of track, about 3 or 400 pieces. 5 boxes full all in all. Most of them are in mint condition or close to, never been used or run. I think he collected them and never settled down so never managed to build a thing out of them. Where would I get information on voltage to run the trains at or prices if I want to sell them perhaps? Most of them are Lima, Arnold, lone star, sigma and a few others from the 1960's to 1980's all in original packing. Any idea what to do with it all?