Market my Android game

Hi there, I plan to buy an Android based game from a developer. It has no installs yet, but it is a high quality game. I am looking to find out how much Admob (if I'm correct this is the place to market the game) costs and how much can an app bring. Please do write your estimates on how big budget is needed for advertising to make it possible to have a revenue of at least a stable $200-500 income per months. For how long can it be achieved? Please do start your proposal by the word APPGAME. Please do answer my questions in your proposal, as well your rate of course. Your task would involve: - before everything, letting me know of budgets bringing the results I desscribed above - setting up a campaign - so it brings stable income for at least a year - and so I don't need to manage the app. We can also work on an ongoing project for a whole year if you want - until we generate at least $200-500 income per month. Many thanks!