Personally, I think the routine maintenance chart in the owner's manual (also in the factory service manual) is a great place to start, especially since you do not know what has been done and what has been neglected in the past.
To your shim question - there is really no way to know what you will need until you get it open and measure. When you get in there, keep in mind that sometimes you can swap shims around, reducing the number of ones you need to buy. For example, if you have one valve that has a 2.35 shim, but needs a 2.15 to get the gap correct, and another valve has a 2.15 shim on it, but needs a 2.35 to be in spec, you can just swap those two shims and not have to buy any, or if the second valve in the example needs a 1.95 to be in spec, you can move its 2.15 to the first valve and only have to buy one shim. In sum, move the shims you have around to get as many valves in spec as possible to minimize the number of shims needed.
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