I'd go about it like this:
1. Royal Rumble (Late January)
Move the Rumble about a week or two later into early February. The Road to WrestleMania has been hideously long and drawn out in the past, and could really benefit from moving the Rumble a little later. The winner obviously goes on to WrestleMania to face the World Champion.
2. Night of Champions (Late February)
A special attraction show between the Rumble and Mania putting over the current champions who will go into SS as well as putting over the "title hunt" aspect of wrestling by focusing on all the people who want to be champion. Maybe add some sort of multi-man match between guys who've NEVER held a title to face off for a chance at the IC Champion at Mania. It would really put over the IC title.
3. WrestleMania (Late March)
After Mania, I'd begin the King of the Ring tournament, with the semi-finals being decided at Night of Champions. The finals will be held at Mania along with the traditional special attraction matches and big time main events. Frankly, I'd add 30 minutes to the show making it 4:30. Adds more time for longer matches.
4. Backlash (Late April)
Bring it back! All the feuds will be settled once and for all, while other feuds will begin. We can put all the hardcore rematches here but still keep some singles matches as well.
5. Money in the Bank (Late May)
I would have two Money in the Bank ladder matches. One for World title briefcase and one for a tag title briefcase. Because of the tag team dynamic, the second match will be plenty different from the main one. 8 men in the World title Money in the Bank and 4 teams in the tag.
6. Survivor Series (Late June)
Move Survivor Series to July. I know it's controversial, but the show is only getting fewer and fewer buys every year. It's current placement is not working. I'd change the show up. Make it similar to WCW's Battle Bowl, but instead of 2-on-2 matches, it's 4-on-4 Survivor Series elimination matches. All the survivors will meet at the end in a Survivor Series battle royal and the "Sole Survivor" will go on to SummerSlam to face the World Champion. I think this new gimmick could work and spice up the Survivor Series buys.
7. SummerSlam (Late July)
The biggest show of the Summer with all of its events. Having a PPV where the winner gets a shot at SummerSlam will make it feel even bigger and hopefully it can build up to be closer to the feeling of WrestleMania. With so many part-timers joining WWE, I'd have some work WM and some work SummerSlam but NO ONE works both. SummerSlam will feel like it's own big deal, and if you want to catch both Rock and Brock, you're going to have to buy both shows in the year.
Also, WWE can't get away with bikini battle royals anymore on regular a basis due to PG, but Summer-time is a perfect excuse to have a yearly bikini battle royal on the big show.
8. Vengeance (Late August)
Just like Backlash settles all the spring feuds, Vengeance will settle all the summer feuds, as well as starting some new ones. Add whatever specialty matches fit the stories at the time.
9. Elimination Chamber (Late September)
Bring in the top guys coming out of the Summer to face off in the Elimination Chamber for a World title shot at Starrcade. It would really put over the returning PPV.
10. Halloween Havoc (Late October)
Bring back WCW's Halloween-themed PPV. It's just a really cool gimmick. It doesn't really affect the card, but the build-up and promotion can be a lot funner. It would be cool if they could get Undertaker to come back for Halloween Havoc along with Mania but I'm guessing that's out of the question. The Wyatt Family could be the creepy focus of the show though. Had they not released Knuckles, he could have also been a cool addition to this show.
11. Starrcade (Late November)
Bring back WCW's biggest PPV and put it over as the Mania of the fall with its own events. You can bring in Goldberg once a year for a match too, as well as Booker T and Rey. WWE doesn't seem like they want to bring back the cruiserweight title, but they can have a Cruiserweight Open at the big show in honor of WCW's division. You can also have a huge War Games match at the show too. Pushing WCW on TV now doesn't seem very topical, but WWE continues to release WCW DVDs every year. There's going to come a day when people have forgotten WCW and those DVDs won't sell. By keeping it in the conversation once a year, they can keep monetizing their huge library.
12. New Year's Revolution (Late December/Early January)
Either on the last week of December, or first week of January, you put on the big show to either end or start the new year. All feuds of the fall would be settled and the Road to WrestleMania will begin. Like Backlash and Vengeance, whatever specialty matches that fit the story should be added to the show.