I'm looking to create two objects/families (Or use some already created).

I'm trying to model a security setup, so I'm looking to create a reed sensor object that I can attach to a window object, ideally and a seperate object that I can put around the place to represent a motion sensor.

My background is not in Revit or modelling, so I apologise if these are particularly simple tasks. Happy to do the leg work if anyone can point me to a good tutorial on how to make them. I've found one or two so far, but they're all a bit unclear. From reading the documents, I think I want to create a host based template for the reed sensor so I can nest it onto the window... But again, but lost so all help appreciated.

Thanks.