I have just started to use SharePoint 2013 and I want to create a simple app with VS2012.
How can I create and deploy an apps in SharePoint 2013 step by step? Can anyone provide a quick start guide?
I would recommend these links
You should install the VS2012 tools : http://msdn.microsoft.com/en-us/office/apps/fp123627
You can use Office 365 to build SharePoint app either hosted in the cloud or locally (to avoid installing SharePoint 2013 on your dev environment.
Hope it helps !