When you start, you will see a screen, that looks pretty much like this. As you haven't studied any cards before, you start by learning new cards. "Today" thereby is the number of new cards left to be learned today, "Total" the total number of new cards left.
In the options section you can change the number of new cards you want to learn per day. However, don't overdo it, 20 new cards per day still lead to 600 new ones per month and you want to make sure you can review all of those cards, so take it slow!