Your lists automatically appear in the Reminders home screen under "My Lists" in alphabetical order. If you generate a lot of ongoing lists, you'll be glad to know that you can re-organize them manually. You might like to move the lists that you refer to regularly up to the top of this section, for example.
To rearrange your lists under My Lists, tap Edit in the top-right corner of the screen, then drag individual lists to a position of your choosing using their rightmost drag handles (indicated by three lines).
Tap Done in the top-right corner of the screen when you're happy with the new arrangement.