Well, there in lay the issue! Obviously bare metal, but from there things get complex...
RLM02 - for those parts that arent bare metal in your wheel bays
RLM21 - semi gloss white - spinner spirals and etc
RLM22 - semi gloss black - spinners and wheel hubs
RLM66 - I would recommend the latter war 'greener' version (as it was the one with additives for chemical resistances and etc)
RLM70 - for Blades
And camouflage:
RLM74 - the Later Feisler a/c that wore the WHITE fuselage balkenkreuz I am convinced all wore RLM74/75/76 schemes
RLM75 - as one of the the standard earlier camo colours
RLM76 - the traditional 'blue-grey' is a must, but lets not over look the creamy-grey, neutral grey and green-grey variants (dependings upon your Werk Nummer and etc)
RLM77 - was used on Bf109's a lot and is suggested as the light grey that was used on wing uppers on some a/c
RLM80 - Some suggest this green was used as a camo colour - I've never used it tho
RLM81 - both the greener and browner variants - from memory, at least 3 variants are known
RLM82 - the lighter green - again multiple variants known
RLM83 - the darker green, which some believe was just the greener RLM81's; regardless, at least 3-4 variants of this are known too!
RLM84* - the 'mystery' Sky-green colour
Thats my 'basic' palette
Dan