There are many ways to climb this mountain. There's a cable car running up to the top, or you can walk from Partenkirchen. We took the tour via the Gamshütte, starting from Partenkirchen. If you plan to climb the whole mountain, you should bring water and stamina; but you will be rewarded with wonderful views. The Zugspitze, Garmisch-Partenkirchen and the Alps can be seen in all their glory on the way up, and of course from the top.
The Wank sees a lot of people, so it is not a walk you should do if you're looking for solitude; expect to meet a lot of other people.