Your Applications folder is probably right where it's always been. Click on your Finder icon in the Dock then go to Macintosh HD (or whatever you named it)/Applications. Drag the Applications folder to the Sidebar. Then drag the Application folder (not the alias you put on the Sidebar), to the Dock.
EDIT: If still can't find your Applications folder type "/Applications" (without the paren) in your Go menu under "go to folder".
-mj
macjack@gmail.com
Message was edited by: macjack