There are three kinds of patents: invention, utility model and appearance patent. I think your application should belong to one of the first two items.
There is no need to do anything for invention patents and utility model patents.
If it's just a new bracket, it's not very innovative, so we can only apply for a patent for utility model. You just need to draw it on the map. There's no need to be precise. It's ok if others can understand. There is no need to make real things.
If it is not only a bracket, but also complicated instructions and good innovation, it is necessary to draw detailed drawings. How far is the drawing? Drawing others can be directly transformed from your drawings into objects without intellectual processing. Of course, there is no need to make it into a real thing.
To sum up, the answer is: don't make things.