There are many different CAD design program on the market today with various features. When selecting CAD program to design your printed circuit boards ensure that the program can export gerber files and NC drill files. Some CAD programs which are freely available for download do not include the option to export to gerber files, without the gerber files we are unable to manufacture your pcb easily, before learning the program always check the features.
If you do not have a suitable program to design your printed circuit boards then we can highly recommend using Sprint Layout Software. The package is affordable and easy to use with all the features you need to quickly and easily design your printed circuit board. North Tech Services stocks CD's of this software which can be purchased and collecting from our premises or we can post it counter to counter anywhere in South Africa.