Let them have the usual run of the house one at a time and keep the other in a crate or playpen. Let them get used to each other's smells and to seeing each other around. A bath in the usual shampoo you use with the new dog may help reduce tension.
Usually the resident dog will show its dominance and the new dog will submit and all will be well. Sometimes the new dog is bigger or more dominant and will take over as the leader. Sometimes there is a lot of noise and spit exchanged before the dogs can be friends.
You can read about introducing your new dog here
www.ddfl.org/behavior/intro.htm
Hope this helps you!
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