Do you have a shopping list you can share. Sorry to make this so basic but I keep seeing your comments with expert advice and I think would be easier to buy a few products that you recommend for the frame, bodywork, engine, wheels and plastics.
I started trying to compose a reply to this, but it's not possible to compress it into a few short lines and it would end up being a huge thread hijack. I've been planning for a while to post a thread about bike cleaning and polishing etc, so I'll do that over the next few days and I'll PM you when I've posted it.
In short, if your paint is faded, scratched, tarnished etc. it needs to be polished. Some paints are harder than others and the polish used depends on how much paint you need to remove to correct the damage, so the decision on what type of polish to use has to be made for each job, so I can't give you a shopping list for that.
Prevention is better than cure, so I highly recommend protecting surfaces with a good wax or paint sealant.
A good all-round protection for gloss paint, metal, plastic etc is a good natural carnuba wax. My favourite is Collinite Marque D'Elegance. It requires a bit of elbow grease to buff off and should ideally be reapplied annually, but it's worth the effort. Don't apply wax to matt surfaces.
With any of these products, this old adage applies:
Good and cheap isn't fast,
Good and fast isn't cheap,
Fast and cheap isn't good.
As I said, I'll post up a more comprehensive thread about it later.