Hmm just to be clear, when you say dps/tank, do you mean a character than can easily switch between a DD ans Tank role ?
Or do you mean a tank than can assist with a bit of DPS ?
Now, I honestly think at low level, nothing really matters because everything works.
For leveling my tanks, I usually put all my attribute points in the resource I'm interested in, have a gear with +resource for dps/leveling, and a gear with health glyphs if I tank in dungeons.
For you, maybe you could put 2 points in health, one point in stamina, every 3 level ? So you will have enough health for tanky situations, and still have a bit of stamina.
And I advise using food buff (even stolen white food is better than nothing) and switch between Lord/Tower mundus if you need more health or stamina.