I'd recommend starting with Slave Pens. You can skip most of the groups that are difficult by timing them. I'd say Bot is the next easiest since you can skip any boss you don't like fighting. Ramps won't be bad once you get some more hps and mitigation. You are geared about where I was when I started heroics. Then again if you wait 2 weeks you could probably get greens that will make you a lot stronger than you are now with little effort.
