If you create your circuit board layout using Altium Designer (also Altium CircuitStudio, Altium CircuitMaker and Protel) from Altium Limited, please observe the following tips. Basically, it makes sense to use all of Altium's default layers.
We are happy to take care of generating the production data (Gerber export) for you. You just have to send us your *.PcbDoc or *.Cam file along with your order. All further steps are taken care of by our CAM engineers.