Confused about technology to be used for development

Hello Forum,

I will be designing a web based app or a website (i am unsure of the what should be used) that would access a remote SQL Server database and start with a login first…based on the login i will provide the user with access to different sections of the website..In future i would be expanding this site with additional features wherein users will be able to upload data too. All the above features should be available by accessing the site from a mobile phone as well as a desktop..There needs to be functionality of reading a device connected to a USB port of a mobile phone (App or website will do this). I am not looking for source code but rather how this should be approached? Should i opt for Android app or a C# based web app or ASP page?

Hope my query is clear…Do let me know if you need more details…TIA