As a zerker, (tank) your primary stat will always be strength so whatever else you do, check out the strength line. Beyond that, rather than relying on what someone else says is the "correct" way to assign points, I would recommend you sit down in a non-combat zone and open the window ("L" key I think) and then read through all the options in each page of the AA trees.
At lvl 17 you really won't have enough points to do much of anything outside the first (sub-class) page, where points are assigned in vertical rows based on the five primary stats (str, wis, int, agi & sta). But that's where you should be anyway!
The other thing to remember is that you really can't make a mistake. If you assign some points and later decide you don't like what you chose, you can always reset and assign everything again from scratch. This is cheap to do the first few times (at first it's almost free!) so as long as you don't keep changing your mind, you're golden!