Tips on freshwater river salmon fishing?

[dwest]

Okay, I am going to pull the dunce cap firmly down around my ears, and from my stool facing the corner, respectfully ask:

Where should I spend my time fishing for salmon?

The rivers are big and I do not know where to concentrate my time. I intend to troll and backtroll, maybe try to bounce roe.

I am not looking for specific locations, just generic descriptions of better areas of rivers to try. For example: straight deep runs, inside or outside bends, mid-river versus bank-hugging, etc.

Can sonar be used effectively?

Thanks.