You will need some of the gear mentioned but I really didn't figure out the trolling/spiderrigging until I had a chance to fish with a couple of REALLY good trollers and pick their brains about what kind of conditions/water temps/clarity, boat control (#1 in my book) and other gear such as trolling motor, electronics,etc. That said, nothing will teach you what you need to know better than time on the water.

I have a good deal on some rod holders if you are interested. They are home-made, welded steel but they have seen a lot of fish come over the sides. I recently went to HyTeks. Send me a PM if interested, I'll send info and pics.