Start with the information that changes the plan: travel dates, group size, trip length, destinations you are considering and the kind of accommodation you enjoy. You do not need to have the route solved before you contact SafariTeller.
A useful first brief might include whether this is your first safari, whether you are combining the trip with Kilimanjaro or Zanzibar, any children in the group, your approximate accommodation budget, and the experiences you care about most. SafariTeller can then help narrow the route and stay options into something easier to compare.