@Billo Another really good tutorial is the one by Philochillo, which you can find in the CF library. There you can also download Philochillos standard conversion symbols and trees
Really good. I'd like to do some conversions. Can someone please tell me in their comments where to find clear instructions how to do conversions and set CF courses.
Good start to find out how to convert OCAD maps for CF: CF home page / OcadConvert / OcadConvert Tutorial :) - I agree SimonM - using also symbolsets based on Pilochilos standard symbolset - helped me really much.