First you need the coordinates of were you are, or going to be.
To find coords I generally use boulter.com
on the page below under Info you can click the Nearby Geocaches link and be directed to the geocaching page
listing all the nearby caches. If you lick the "map it" image on the top right you'll see a map of the area with all the caches.
Download/Copy the coordinates (+clues) and off you go.