No Problem. It's time to get started! There are several ways you can collect email addresses.
Mustang List provides a list building tool in the form of a sign up box to be put on your website. Your site visitors can sign up for your email list and their addresses are automatically imported in to your Mustang List account. You have access to this tool even in the free trial.
Other ways to collect would be to set up a guest register and have customers provide you with their email addresses that you will import in to your Mustang List account. Trade shows, conferences, purchases - any time you touch your customer, invite them to join your list.