You don't need a template. Just write the TC as though you plan on changing all variables in the future. Use a lot of parameterization. Why not take a shot at it and post a few TC's. Then we can help you onto the right path.
Life should NOT be a trip to the grave with the intention of arriving safely in an cool and well preserved body, but rather to skid in, chocolate in one hand, beer in the other, body wrecked, totally worn out and screaming WOO HOO what a ride!