Well, see that depends on the setting you're trying to place them in. Have there been Digimon sightings before? Were there any odd events in their lives to do with them? What year is it? What kind of world are they involved in? You need the setting if nothing else when you plot out a story.
I read the beta (I hope SS told you that) and I'm wondering "how do I do this? Do I make them seem like newbies or do I give them a little bit of experience?"