Welcome from Northern Idaho. I know that everyone has their own way to store scraps. I have taken several see thru bins with plastic lids that stack on top of each other and I sort by colors. I don't usually keep any scraps that are less than 2 x 2 unless I have a special project in mind, but I do put them in a separate bin for a few months to see if I need them for anything before I part with them. I usually donate them to special causes. As for templates there are a lot places just do a google search and you should find alot of what you are looking for.
Welcome again!!!