Consider, for example:
Do you have seasonal-only customers, bargain-hunters, or customers who are only interested in certain types of merchandise, services, or events?
Are you an organization that needs to send different content to donors, sponsors, members, or other patrons?
Does it matter if your subscribers are local, domestic, or international?
Do you sell products or services online, and ask customers to sign up for email marketing in the checkout process?
What other variables affect your audience and each list you manage? Determine what information is relevant about your subscribers and include it in a column in your spreadsheet or database.
Get organized before you create your MailChimp list to help you get the most out of it in the long run.