You may or may not be aware of the game, Team Fortress 2^(). That is the game where currently I'd like to focus most of my attention. A series of updates bringing new maps and new weapons to the game would be my first big project. A number of smaller projects^(*), to build a friendly rapport between myself and the players, would be the first things to come out though. Other smaller projects would include little updates with "a cosmetic item here and a weapon there." All of this would increase my skills, and would produce content for the players.
You may or may not be aware of the "movable desk" policy at Valve. Other projects are (obviously) going on, and tbh just being a part of them would be a delight. If at all possible (and it should be), devoting a day or two to help other projects along while working on TF2 3-4 days out of the week would be my ideal weekly schedule. Doing this would add to my knowledge and skill base, help create content, and would build relationships between my co-workers and myself.
After a few months, maybe a year or two, I'd like to start working on my own game ideas.
^()Steam Store Page
^()Wiki
^()an official reddit account to communicate with the /r/tf2 and /r/truetf2 subrredits
^()an AMA
^()Easter-Egg like hunts with rewards for players
^()Placeholder for other ideas I have. Don't want to give them all away. =)