Noobie question about stamina.

[FroglokCaster]

So I recently got my warrior to level 57 and decided to test out my new precision disc, but to my surprise before the disc ran out my stamina bottomed out. I tried it a few more times and could only get about 60% through before running dry. With this in mind any tips on increasing my stamina or decreasing my stamina loss outside of asking someone to cast invigor or canteena ?