Cairn, MO, Samarog, Escort, KC, Gorseval, River are completely easy for anyone to learn extremely quickly. Just get some decent offensive gear, watch a guide from mighty teapot, and join some pugs. You probably can get away with some WvW gear if you run support. There is no real reason to buy a dhuum kill, you can get any of the boss kills I listed with a little bit of work.