If you're restoring from a cold backup, you shouldn't need to recover from anything, since everything is from a single point in time and is all synchronized as far as SCN's and data are concerned.

If you're recovering a hot backup which requires applying archived redo logs, then you need to follow the steps outlined already by the others.

If the log files from your cold backup need media recovery, just

> startup mount
> alter database recover until cancel;
> alter database recover cancel; // might say recovery hasn't started
> alter database open resetlogs;