another good online reference is
Repair Help Articles | Park Tool
I concur with clean, lube, make work but don't put new parts on.
Does this bike fit you ?
also if you list you location (or close) people will often give ideas of good bikes for sale in your area. It is often cheaper to get a better bike upfront (used) than to put a lot of parts on a lower end bike
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)