I just got a new kitten for Christmas (my Christmas present to myself) and after three months Emily (my older cat) and Tanner (the kitten) are still getting to know each other (but the three of us sleep together at night ). But it takes time and patience (and some kitty treats and wine), so don't assume that they won't get along.

I also agree with about the outdoor thing, so I will keep out of it.

Be patient and they will do fine.