How does Procs work?

So my problem is that im new in wow and i wanted to know some things about procs.
The thing is that i made a shaman and bought a epic weapon called Flurry Axe (https://www.wowhead.com/item=871/flurry-axe#comments) and reading the comment section i realized that that axe is not really good.
For what i understood (im now native in english so i have some troubles while reading) the internal cooldown of Windfury and that Proc are the same, but if for example i wanted to use The Hand of Antusul (https://www.wowhead.com/item=9639/the-hand-of-antusul) is there a shared CD? How do i know if there is a shared CD with my WF or FT to know what weapons to use as a shaman??