Created genesis block and set up node. How to mine?
If it's predetermined that 80,000 blocks remain, it sounds like you haven't cleared out the checkpoints.

It's been awhile since I looked at anything other than Ripple or Nxt, but you should be able to find the checkpoints by simply searching for "checkpoint" in the code or the assert()s.

Also, to keep yourself from interfering with the original BlackCoin, you might want to use another port.