1.
Boggle at the insanity of handing control to me when I don't even play the game as his company currently has it envisioned, packaged and marketed.
2.
Meeting with relevant personnel to have them explain to me, if possible, why the game as it currently exists is preferrable/superior to other, possibly multiple approaches to play.
3.
Probably start work on 5E. Now I hear what you're saying out there, but the premise IS that _I_ have been given control so pipe down pipsqueaks. I personally would want an edition that is greatly less rules-dominated, but not exactly rules-lite either. I want to be able to readily facilitate multiple approaches to playing D&D without players having to ever argue again that the current edition feels like the game is actively working against them. Players who want rules-lite can overlook/omit a lot of rules without feeling that the game will punish them for doing so. Players who want all-rules-all-the-time can... I dunno... obtain an Expanded Players Handbook that allows them to wallow in rules trivia to their hearts content. Meanwhile, the standard game will be somewhere in the middle which is where it should be, was originally intended to be, and where I feel works best - until somebody can show me hard data to the contrary.
4. RESEARCH. I want to know more than that people are playing the game. I want to know HOW they play it, why they play it the way they do, if they would/could play it differently, how all that has changed with each new editions release and as that edition has itself aged and grown. I need to know from my new top-o-the-heap position how the game got to where it is and where I can/should take it regardless of how I personally want to play it. Of course, MY way will have more chance of success because I've already been told that my way is better.

Still, I'm not that self-obsessed and near-sighted.
5. Reprint out-of-print materials. If people want to keep buying the 1E DMG why the hell should I not profit from letting them buy a nice, new printed version from me instead of an old, tattered, used version? Besides, this in itself becomes ongoing research into what direction to take the game. If more people buy the previously oop products shouldn't I be profiting from them directly instead of letting a secondary market do so? Shouldn't I be providing the most support to the the most popular approach to the game rules? The current rules are always more popular because
they are the current rules. I want to know which rules are better for the game and its growth. Making those decisions on hunches and simple momentum would be foolish.
6.
More research. What is THE FUTURE? People will probably always be playing pencil & paper D&D of all existing versions forevermore, but running ALL of D&D is more than just deciding what rules to use for p&p editions. Can play be better facilitated by computer hardware and software both for at-the-table gaming and online play? I personally love the potential of equipment like the MS Surface so should I be investing D&D in that as well? If _I_ don't take D&D in that direction someone else WILL and I'm left with 1000 diehard luddites carping about how things USED to be. D&D doesn't have to be all one thing and never anything else. Learning what it CAN be doesn't have to involve preventing it from being EVERYTHING else.
If D&D can be 1st Edition, 3rd Edition, 4th Edition, computer games for any and all of those, minis, play-by-post, novels, movies, TV, and more - shouldn'T ALL of that be what I want to have people buying from me in some way/shape/form? Aren't I just being an idiot if I'm telling my potential customers that D&D has to be THIS edition and no other simply because _I_ want it that way - and then watching as my potential customers do what they want with it anyway without paying me to do so?
7.
No battle plan survives contact with the enemy. My first general goal is learning where I really need to go. Only after I have that CLEARLY determined can I determine how best to lead my troops in that direction.