Number of teams
I would say that the optimal amount of teams is 12. 14 is ok but it really is a benefit if you have a top 9 draft pick. While different dtartegies are employed, the only way I can see a 14 team league being optimal is if all players are scored somewhat evenly. (As evidenced this year, there just arent that many top flight RBs)
Draft type and keeper rules
I think the best type of draft is a Live limited keeper draft. IMO, the best day of the year outside of your wedding and kids being born is the draft day. I dont like going into a draft or a league knowing that I will never get LT, Peyton, SA or LJ. Because of that we have a keeper rule that states you can only keep a player if they were drafted in rounds 6-22. The max time a player can be kept is 3 years so even if you invest a 6th round pick on a rookie, you can only keep that guy for three years and then he goes back into the pool. We also have a rule that if you keep 2 players, you lose each of the rounds that you drafted them in and a 3rd round pick. Think about it this way, you draft S Smith in the 7th and LJ in the 8th in last years draft. Would it be worth it to you to lose a 7th, 8th and 3rd this year. I would say so. I think the most fair way to draft is a normal serpintine draft. I need to know where I am going to pick every round. It would be too unsettling to change after every round or two.
Roster size
I think that 2 QBs, 2 RBs, 2 WRS, 1 TE, 1 K, 1 Def, 1 DE, 1 DT, 1 LB, 1 CB and 1 S is the best way to go. W ehave never used 2 QBs but it makes the draft and the league a lot more unpredictable and competitive
Starting lineups. We also have 8 bench spots and no IR.
Scoring
I like 1 pt for 25 yrds thrown, 6 for all TDs, 1 pt for 10 yds rushed/recieved.
0.5 ppr for RB, 1 ppr for WR and 1.5 ppr for TE
3 point bonus for 300 yds passing, 5 pt bonus for 400
3 point bonus for 100 yds rushing/recieving, 5 for 200
1 pt for all IDP tackles, .5 for assited tackles, 3 pts for sacks bonus 2 at 3. 4 pts for INT
Free agency rules
We have a $30 budget for all teams that they can use to bid on players all year. This adds a ton of strategy and forces guys to look more towards trading which is part of the game
Tiebreakers
We leave ties as ties but in the playoffs, each team picks a player that is not starting and that is the tiebreaker guy. The team whose tiebreaker guy scores more points wins
Schedule / Playoff format
We have 12 teams in the league and a 13 week schedule. Playoffs start in week 14 and go to the 16th. Each team plays the other once and 2 others twice. We used to have 3 divisions with 4 teams each but it was not fair because there would always be one division that was bad and then the leading team in that division had the advantage so we scrapped divisions. 6 teams make the playoffs with the topo two getting byes.
Money/Payout
Our league fee is $230 with a lot of payout opportunities. We have a $50 high score of the week payout. All playoff teams get 50. 3rd and 4th get money as well.
League Extras
I think a live draft is essential. if all guys cant make it then of course its up to you but the live draft adds so mush to a league. We have a drfat board that I have laminated and player labels that are laminated as well. I put velcro on the the board and labels so we can continue to use the board and label every year. We give out a championship ring to all the winners as well as give the league champion a travelling trophy every year that they can keep until the end of the season (like stanley cup)
Have Fun
Remember that its just a game and dont allow your Sundays to be ruined like I do. DOnt be mean to your wife or kids because you scored the 2nd most points but lost to the guy who scored the most (I am guilty of that). Use some of your winnings on the family so they dont begrudge it.
Buy a custom jersey, it is awesome and your league mates will be jealous and just have fun