I'm a new salmon fisherman.

A friend recommended that I look in to buying/using divers to get down to certain depths. Of the several brands and models out there, are there any recommendations on which to use and why?

Also, is it recommended I use a certain length and action of rod to most effectively use them?

I am guessing that weight/diameter of line and its type would affect how deep the diver goes. Am I guessing correctly? Any recommendations on lines?

Finally, does a guy REALLY need to use those snubbers that are advertised to go along with the divers?

Thanks for your help!