First I determined how many games each team would play. For instance, I think Washington will beat Tampa and lose to Seattle, so I'm giving them a 2. Also, I think Carolina and New York is a toss up, but the winner will lose to Chicago, so I'm giving each of them a 1.5. Then I figured out every player's PPG this year using the playoff scoring system and multiplied that figure by my projected games played. That should give you a rough estimate of how your players will perform, though you could get more in-depth by applying some match-up factors. I tend to think the overall PPG takes that into account already, but to each his own.
I threw some VBD numbers on the guys, but if you're in a league where you have to take a player from each NFL team, you may need some VBD numbers based on their team. For example, I'm doing a league with only 3 other guys and we have to pick 3 QB, 3 RB, and 3 WR, 1 TE, 1 K, and 1 D, each from a different NFL team. So, I know there will be 4 and no more than 4 players taken from each team. After using standard VBD in the first few rounds, I could see the team VBD coming into play later in the draft. Haven't quite analyzed that yet, but I may later today.