ok, i'm gonna be doing a tune up (158,000 miles) soon and need to know what i should do/replace

so far i got on my shopping list:
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[] Spark Plugs (what kind?)
[] Plug Wires (what kind?)
[] Distro Cap (what kind?)
[] Timing-Belt and waterpump (...can i DIY, or not?)


anything else?

btw, will fuel injector cleaner help at all? my dad say's no because i driving long distances everyday (12 miles, 1/2 hour drive to town) and burn all the "bad junk" away...he says to just run Premium Gasoline once and a while