As far as getting self collected material goes in the area, I probably can't be of much help. the best advice I can offer is getting a book about the area. The only one I found with a quick search was this one. If you're interested in buying pieces for your collection though, I can offer some better advice there.
No problem! I really like that book, it’s definitely better than most, but still missing a bit. You can get it on amazon. Also, my personal favorites are for just Agates, #1 being “The Other Lake Superior Agates” by John D Marshall (it’s out of print, but I think you may still be able to get it from the author), and “Agates Inside Out” by Karen A Brzys. Here is what the covers look like to make them a little easier to find.