Newbie questions (again)

[rivercatch]

I have a classic 1997 Rover Mini in old English White. The paintwork is in average condition - some marks on some panels, other panels have been resprayed in the last couple of years. I can't yet afford a full professional polish of the paint (maybe in spring) and as a newbie I'm not starting with cutting compounds & power tools myself. So I just want to do the best protection job I can for the winter.

I've read here for research, and this is what I think, given I'm on a budget:

1 - Wash, (wheels first, two-bucket method) - Autoglym Bodywork Shampoo (which I already have)
2 - Clay ????
3 - Polish - Autoglym Super Resin Polish (which I have)
4 - Protect - Autoglym Extra Gloss Protection (which I have) and/or Autoglym High Definition Wax (which I need to buy).

Is the clay step necessary? If so is there a good simple product for a beginner & occasional user which won't cause damage?

Also is it both the Gloss Protection and the Wax - or only one of these? If so which is better.

Also the reason I have the Autoglym products is that I was given them.

Also the Mini has to live outside, and it has a vinyl/pvc sunroof. I have a breathable waterproof cover that is used most of the time.

Thanks,