I'm guessing you already have a bucket with a grit guard? Also a quality lambswool wash mitt?
The Meg's Gold Class Shampoo is a decent product, no need to buy any other shampoo until you run out. Again the Meguiar's Clay Kit is a good kit, perfect for what you need.
Although the Meg's 3 step system is ok, it's really not the best.
Ideally, you want to:
Wash
Clay
Wash
Polish
Protect
That is very basic. You could maybe add Dodo Juice Lime Prime as a polish, and maybe Colly 915 as your wax/protection?
Applicators are cheap enough to add to your products, maybe some Meguiar's Soft Foam or Dodo Juice Blue Roo's.
Maybe you could try a Poorboy's Sample Kit:
http://www.waxamomo.co.uk/productcart/pc/viewCategories.asp?idCategory=57Just to try some different products without paying out too much.
Chris