The idea of making an online manager game has crossed my mind in the past. But whilst I've had several ideas in my head in regards to how I'd structure the game to be better than other competing games, I lack the coding ability to put it to practice. As such, I doubt I could help you all that much with your manager game, especially since I don't even know whether you were planning to make it a predominantly offline single player experience, or an online multi-player experience.
However, if you do want to hear some of my thoughts and ideas regarding how I would approach an online manager game, let me know.