These are great questions and I've been wondering about obtaining accounts myself. From my understanding you receive 5 accounts per block found. I thought that you also had to be solo-mining to acquire the accounts, but I'm not 100% sure here.
With that said, I've been solo-mining for several days without a block found. I'm not putting a ton of hashing toward this (~500 MH/s) , so I'm wondering how futile my attempt is?
I hope someone can answer these questions along with yours soon.
