https://steemit.com/steemit/@dantheman/brief-update-on-reputation-score
This explains it pretty well. The only that that has changed since is rep is more granular and it starts at 25 rather than 0. The highest reps are around 74 I think with poor @wang at -16.
Thanks. This is exactly what I needed. I wish that these resources were easier to find for us newbies.