Three Way Rig
Start with a three-way swivel. Tie the line from your reel to one of the rings. Tie a short piece of line with a sinker attached to another ring. Tie another length of line with a hook on it to the third.
Adjust the length of your lines according to conditions and experience. Lengthening the line from the weight to the swivel will raise the bait further off the bottom; lengthening the line from the swivel to the bait will allow more freedom of movement and let your bait move naturally in the current.
Bass fisherman will recognize this as a Carolina Rig. Slip a barrel sinker on your line and then add a bead or two. Tie the end to one ring of a barrel swivel. Tie your leader and hook to the ring on the other end of the swivel. Adjust the length of the leader running down to your bait to the prevailing conditions.
Bait Walker/Bottom Bouncer Rig
This is commonly known as a Lindy Rig. It consists of an L-shaped wire with your weight on one end and a ring on the other. A wire extends down below the weight to permit your rig to “walk” along the bottom.
Tie your line from your reel to the right angle bend (elbow) in the wire. Tie your hook to the ring with a leader. With most models you can adjust the length of the wire from the sinker so as to adjust the height of the bait above the bottom. This rig is especially useful over rough or snag infested bottoms.