Heres a basic drawing of how you set it my gear for rivers:


Basically you run your line through the bobber, and you wrap it around the bobber about 3 times so it stays stationary. Then you let about a foot or two of line hang out from the bottom, and you ties one of those weights on, then on the other side of the weight you put about 2 or 2 1/2 feet of leader on then tie the jig to that. You can adjust the depth by loosening those three wraps around the bobber and then that way you can adjust your depth according to the run your fishing. Usually your going to want to keep your leader length pretty short cause their are runs where its only about 2 feet deep and you want your gear right off the bottom...

However, if you aren't using jigs and your using the anchovies/herring, you basically do the same thing but tie the weight onto the line right below the float and then give yourself about 4 or 5 feet of leader and then put your hooks on the bottom. Usually salmon mooching leaders are perfect. They are like 5 ft long and have two hooks so it will keep your herring on good...

Hope this helps Musky Man.
And sorry to get a little sidetracked.
Seriously though if you all have any crab questions let me know...