This question will likely be quickly closed: How to make a POE switch?
In itself, the question is valid, although a bit broad. We could expound on what constitutes a Power-Over-Ethernet switch - from the magnetics to the processor, at an overview level, it could be explained fairly easily.
However, the asker is an admitted neophyte, so will not likely be able to utilize much or any of the information given. Therefore the question is closed.
But someone else will come along later and be able to use that information.
At what point do we answer the question, and not the asker?