Welcome to PF!!

Ok, in my opinion:

Oil: recommended is 0w40/5w40, although some people run slightly thicker due to the top ends on these cars being noisy, make sure its fully synthetic too. Im running my series 2 engine on 10w40 Mobil 1 (my mate works for Renault and gets it me free )

Plugs: any good name should do (eg NGK), although if u look on eBay there is always genuine Motorcraft plugs on there.

Panel filter: Probably be worthwhile to get a K&N or similar panel replacement.

Plug leads: Ford Motorsport ones if u can find them (blue aswell ), or if not i believe Megaleads are good aswell?

Hope this helps and no doubt if what im saying is wrong someone will correct me