I would like to submit information about the device in my iphone application. i.e what device is using the application and the date. I would really appreciate it if you could tell me/point me towards how I can upload this information via php to my MySQL database hosted on my website. I would also need to know how to set up this database assumably via php too so that the columns would contain the correct information.
Instead of cooking up your own implementation, have you thought of using something like Flurry? Besides the things you listed above that you'd like to track, Flurry helps you track other useful data. Another analytics service to consider is Google Analytics for Mobile (though it seems a bit rough right now...).
Hope this helps!