On the vedder river i find there is alot of current seams, and there is quite a bit of pocket water, on the lower there are the nice long runs aswell. Float fishing will probably be what u will be doin. I use alot of natural bait because i find the scent adds to the presentation, but i also have a few artificial favourites. Steelhead bite alot more than salmon, in my mind i think they do feed. If u can present something infront of them they will take it, but the presentation is the key, on a river with lots of pressure it needs to be almost perfect but dont let that discourage you. A few baits to consider, roe, roe bags, normal worms(they are taken deep usually so i dont recomend them) normal tiger prawns. There are so many artificial baits my favourite 3 are the spin'n glow, Colorado blade spinner, and normal wool(yarn). Remember to cover lots of water, cus u show more fish your bait, and to switch up baits through every run, i will usually use 2 or 3 different baits through a run if possible. I like roe as a starter bait, then i'll switch to the prawns, and then finally to the blade as a clean up bait, if a fish is agressive they will usually take your bait. And if u come to a run with another bunch of guys, use what they aren't, if they're all using roe, or roe imitations a spinner or pink worm might do the trick, show the fish something different.
Good luck and have fun.