3D Printing process starts with 3d designs, which can be either available from different online repositaries or can be created using 3d CAD softwares. For creation of basic shapes and designs, you do not need to be an expert in CAd design. In fact, a lot of free softwares and corresponding online tutorials can get you started with CAD design till certain level. You need not be an expert for creating basic designs for initial prototyping.
We are trying to a list of good softwares which are intuitive, free and can let you create decent output for 3D printing. Of course, for any complex designs or specific requirements, our in-house team can always help you.