While there are better guides and better descriptions of the statting/tiering process, let me elaborate a little.
For an DPSey classes (and healer/tanks too, although they do things little differently) the three things you are trying to keep high are damage, crit chance and attack (physical or magical, depending on your class). The choice of what to do with gear depends on the attribute you are trying to raise.
1) Damage. By far the hardest to raise. Damage comes from your weapon mostly, although some chests and set bonuses give you a little bit of damage. Still, to increase damage, you focus on your weapon. And that means you don't care about weapon stats, just tier and plussing. Stats can come from elsewhere, and since stats and tier are tradeoffs (you can have high tier and bad stats, or low tier and good stats), weapons are not statted. Take a look at AH, you will see a lot of weapons that are Tier 9 or Tier 10, but have crappy green stats like Stamina I. There are some exceptions for scout and rogue off-weapons, you don't really need to worry about it yet.
2) Crit. Crit comes from a number of places. Not too many, but more than damage. A lot of gear will give crit bonus. At high levels necklaces will have very high crit because plussing increases it. The best gear for DPS classes is usually the one that gives attack and crit.
3) Attack. Attack comes from all over. Most good gear gives you attack. Raising attributes (str for warriors, dex for rogues, int for mages, etc) gives you attack. There are set attack bonuses, and most importantly, good stats will give you attack. Since attack is so common, you dont worry about it on the pieces that can give you damage or crit. In other words, if you can't get a piece that gives attack and crit both, you go for one that gives crit before one that gives attack.
There is a lot more to it, of course, this is general basic overview. The upshot, though, is that on weapons you forget the stats. Unless it is off-weapon that you don't rely on to cause damage, you tier it up and pay no attention to stats on it.
And, what Mal said about L55 is important. At L55, great gear becomes available. ZS/DL and to lesser degree HOS are sources of gear that would put your L52 gear to shame. Take a look at gear with addon like Character Plan, you will see the difference in numbers.
Last but not least is the XI factor. Current high zone, Syrbal Pass, drops XI stats by bucketloads. You can get guildies to farm you some or get them fairly cheap on AH. Taking clean white unbound high OD piece of gear and putting good XI stats on it will give you a lot more than trying to use what gear you already have. At least a lot more attack, which at your level is probably all that you need to worry about. Then taking a good OD L55 weapon and making it perhaps T7 will give you decent damage as well.
-- Rustyx --- 92R / 92S / 92M on Reni (Guild KnightShift). Yes, running the new FOTM R/M, cause I am not elf enough to be WD/S.
Oh, and people who have more than 3 classes are clinically insane.