Making an effort to create my own artwork. We are having several brochures printed. Does anyone understand what CMYK means since it tends to make my colours appear completely different?

I have just opened up a new bar located in manchester. I want to carry out some door to door leafleting in the region to advertise my company. Ive searched around at nearby print outlets but the majority of them look too expensive and / or cannot perform the correct sort of print out. Im looking to ...