i suggest going to a training dummy, taking off your trinkets, and trying a bunch of different things:

1. just have lightning bolt in a button, spam that for 30 secs. see what your dps is.
2. put flame shock, lvb, and lb on 3 sep buttons and rotate between them correctly (fs, lvb, lb, lb, lb, lvb, etc).
3. use a /castrandom macro

the 2400-3k dps you see is when grouped up, elemental oath up 100% of the time, totem of wrath, pally/DK buffs, etc. It's going to be a lot lower when you are solo, w/o trinkets, against a training dummy, but you will get a good idea of the difference between 1-3 and see what works best for you. For some people the diff between 2-3 is HUGE, for others its very, very little; it really is going to depend on your latency, gear, how fast you spam buttons, how good you are about using dmg-boost items, etc.

As hachoo said too you want some hit, at least 60 for heroics and 200-300 for raiding.