What are your interests? You have a very open agenda and I like that. Personally, I went down the ACC list and tried to get one (or more) of each....then after that you can go for the uncataloged ones, backs, variations etc.... That will last at least this lifetime
. There are a ton of websites to help but if you want an easy one, I have most of them listed (pre-1950) on my site. Nothing is for sale on it...but here it is ...*(scans of each under each listing)... it's a big "work(addiction)-in-progress".
www.luckeycards.com