You will also be able to find a vanilla bifold door in the OOTB Revit library. Best practice is to take an OOTB family and tweak it to make it what you want it to be. Open the family out of your library, save a copy (NEVER overwrite OOTB stuff!!) and examine it. Trust me - inspiration will follow, and you will be able to tweak it with the best of us. Any questions while you are in the process - there is more than enough skill and experience on this forum to get you out of any sort of hole.
Some pointers -
1) You may need to edit the panels for glazing - select the panel and click on Edit Extrusion to do so. This will take you into sketch mode, where you can add the shape of the glazing and accept so that Revit creates geometry for the glazed panel
2) always always create Reference planes, constrain them with dimensions and parameters, and test them to see if they stay together. Then align and lock geometry to the reference planes.
3) Never lock geometry to geometry - always lock it to reference planes (I learned that the hard way)
Rina Sahay
Autodesk Expert Elite
Revit Architecture Certified Professional
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