What will a person need if he plans to walk the great wall from the beginning until the end??

From the beginning to the end, do you mean from the Shanhaiguan to Jiayuguan?
If so, I think it will be hard work for you, because most of the sections are disconnected now and some places are so steep. But you may have a try.
First of all, I think you need to know the detail information of the current situation and the distribution of the Wall. Then you need to prepare a package of mountainnering equipment. In this way, you can start your journey. When you climb, it is suggested to join the local outdoor hiking clubs to keep safe.

i don't mind hard work.thanks a lot!! :D