I would start by pulling plugs or what some call hotshoting,The best way to go is get a variety of plugs to match certain water clarity conditions.If you are a begginer Taddpoly's would be a good choice,They rarely need tuning and work great.Gold or silver with any combination is good to start.
Hot Shot 35's are another plug that works great in about the same colors. Metalic Pink or the black and white copcar work great when the water is colored. Their is a great book that explains all this better. It is How to Fish Plugs I would pick this up They have it at sporting goods stores or Amazon.com or You can order it through Salmon Trout Steelheader magazine.
Also your favorite fishing supply store can be a great source for information. Also you might want to book a guide trip and get some hands on experience with someone who is a pro and will save you a hack of alot of money in the long run.
If all else fails watch what the other guys on the river are doing, ask questions 99% of the people on the river would be glad to help.
Good Luck.