Note: some of the below links are affiliate links, however, they're products I personally use or believe will be of help to you and cost you absolutely no more. I make a small commission on some of the products if you purchase through the below link.
Seed Saving Resources
Row Cover Fabric and Insect Barrier Cloth
This cloth can be used as a barrier for both insects (and cross-pollinating insects and cabbage moths, so it works for pest control as well). You can also cut this up and make your own bags for pollination cages or bags.
Seed Saving Bags and Packets
Different sized bags for blossoms, corn shoot and tassels, sorghum, and seed packets for seed saving and cross-pollinating barriers.
Seed Saving Books
Seed to Seed: Seed Saving
by Suzanne Ashworth. This is the Bible for Seed Savers, it breaks it down on when to plant by region in the United States and focuses solely on seed saving for each plant. This is the book I use when I'm seed saving something new or encounter a problem