Hello, 
I'm a marble noob and was thrilled to find this site with so many knowledgeable people in one place. 
Basically, I bought a bunch of marbles from a guy who was cleaning out his deceased grandfather's house and was trying to get rid of everything. 
I don't collect marbles but I have always found them interesting and when I saw them I took a chance and bought them all. 
So, without a plan except that I'll sell any that are worth selling, I now have a couple hundred marbles with no idea what they are or how much they're worth (probably not a lot but I'd be curious to know if any are sought after). 
My question would be, what should I do first?  How should I separate/categorize them. 
Any advice would be greatly appreciated. 
Thanks, 
Mike