To start out you will want:
A pre wash like carplan rapid dirt shifter.
Small detailing brush for wheels. Clean with normal shampoo or pre wash.
a PH neutral non gloss enhancing shampoo. Dodo juice born to be mild
2 buckets or bucket with grit guard.
Lambswool wash mitt.
Plush drying towel, Asda orange towels are good and cheap.
A tar remover like Tardis or oblitarate.
Iron remover, IronX.
Clay, bilt hamber with strong dilution of shampoo as lube.
A pre wax cleanser or all in one filler / glaze like dodo juice lime prime or autofinesse tripple.
A wax or sealant to protect your hard work, GTechniq C2v3 spray sealant of bouncers 22 wax.
A nice quick detailing spray for using after general washes. Zaino Z6.
A selection of applicators and microfibre towels