If your spell damage is 932 unbuffed, your gear is terrible. No matter what rotation you use, you are not going to pull very high dps. The simple answer you are looking for is that you need to sort your gear out.
Here is a gear set I compiled (pre 3.1, but that won't matter much) using entirely BoE blue gear - i.e, cheap stuff you will be able to buy from the AH. That alone will get you to 1300 spell power, which should be sufficient for you to do heroics if you have your rotation sorted. From there on, use a warlock pre-raid gear guide to see which heroics you want to get drops from, which epic drops or crafted gear you need, and so forth. I'm sure you'll find something if you do a search.