Required Mobile App for Accounting Firm

Need an app to represent our firm. additional to basic stuff, we want smartform to collect and process data e.g. tax refund calculator based on ms excel back end to work out estimated tax refund. need to have inquiry form/appointment booking form mailing list subscription secure form to sign up to complete the tax return online where client will input TFN, DOB and other basic information. facebook integration for updates prefer to have a look at prototypes and please advise the cost