Facebook Application Needed

We need a team to develop a facebook application. We are a web development company but this is our first venture into facebook applications. We are not sure what language it needs or should be done in and need specific answers from the team submitting the quote. More details would be given after acceptance, but the concept is: App is calendar based The app would allow people to create items in 5 separate categories. The items they create are tasks. They can create this task in a list form for that day with settings like repeat daily, weekly, bi weekly, monthly, yearly they can set how long the task will take they can then check off the task if they complete it the site will then track: -the % of tasks completed as opposed to created and not finished -the core functionality of the site is then the app will track the % of time spent on each of the 5 main categories and also the success % of tasks -Looking for solid system of pie charts, time line charts to monitor success or variable times and categories.