Hello Sir Kendrick,
Most would recommend a dps offhand, so if you hold onto your dagger until you hit 100 you can pick up an ax (ice/fire/magic, in that order).
At your level a tanky build isn't necessary as most bosses at that level can be downed without siege, and leveling a tank is slow comparatively. However, tank can be fun and has its merits, so it's up to you on that.
If you do select a shield though, I would rank the wind shield above the mountain one as the mountain provides evasions which can be an uncertain defense and not enough more armor to make a large difference, while the wind provides a good health boost and a small hp regen which can be handy.
Hope this helps, and good luck!