Having the right supplies will make the process easier. Hanging folders, files and labels are necessities. You'll also want stamps, envelopes, Post-it notes, a stapler and pens. Put them all in a box.
Label your hanging folders according to your needs, but I like to use these categories: home and auto; healthcare and insurance; saving and investing; income and taxes; and credit cards and other debts. Then you can use file folders to sort subcategories. Let's say you have two credit cards; you'll want a folder for each. Start fresh every year.