I am just beginning to look at what sort of material I'd like to include in the game so nothing is set. My plan is to have the players create their characters using the d20 Modern core rulebook and not much else. I am thinking about giving them something extra to make them special but I haven't decided on that one yet.
Once the game gets going they will encounter all sorts of things such as vampires, demon summoning cults, werewolves, ghosts, etc along with some missions involving surveillance, investigation, or perhaps even acting as couriers of important information or people.
Once they get to about mid levels I plan to introduce the theme I hope will become the focus of the game as the plot unfolds. Most of the things I plan to add in (new/future tech, robotics, etc) will be encountered as the opposition first and once they overcome it then they may have access to the technology. Almost all of this new technology will need to be turned in to the organization that pays them.
One thing I want to include is a group that experiments on people to turn them into "super soldiers" by giving them drugs/robotics etc. Of course the group would have to figure out whats happening first and then figure out what to do with the information they find.
I want the focus of the game to be about information, allegiances, and such instead of just combat after combat. This is my first attempt at running a modern game and also the first time I won't be using a pre made adventure so I hope I can pull it off.
If anyone has any other thoughts I'd be glad to hear them!