What do you have in mind for the style and theme of the business card?
Based on the available (and attached) logo, the business cards and the stationary should have a clear and fresh layout.
My initial and currently preferred idea is that the text should be in a good readable grey or it should pick up a green tone from the logo, but if you should have another idea, please feel free... ;-)
For the stationary please consider the German guidelines for the position of the receiver's address - that will facilitate me to use window envelopes. Attached you find the design of another stationary that I am using (for another business, i.e. not for Oils4You).
I would like to ask you to consider the attached format guidelines of my preferred printing shop. In particular, please provide the designs with CMYK color setting.