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It's a good idea to introduce them gently. Put New Cat in a closed room, and let Old Cat have run of the house for a while. Then swap them, so New Cat can experience the smell of Old Cat while exploring the space a little. After a few hours, swap them again. Prepare for Old Cat to be a little freaked out at the smell of New Cat in his space.
Keep doing this for a while until the tension is relatively low. This may take a few days.
Then put them in a room together and watch them. They'll probably stare each other down for a while, and might begin some exploratory fisticuffs. Don't let it get out of hand, but don't assert yourself unduly--it's important that they work out dominance issues as early as possible.
After a while they ought to be cohabiting fairly peaceably. They'll run around a lot and probably squabble, but that's normal cat interaction. It looks like fighting to us, but it's extremely normal.
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