Now that's interesting!
It is relatively simple to start compared to others, and it will probably be easy to track errors as well.
(By enabling error_reporting it tells you the exact file/line an error occurs in, so make sure you check that up)
The best part of is that even though it starts very simple, you can grow it to be very well structured and build upon app upon app..
Once you get past the basics of how variables, arrays and objects work, you can start building basic reusable functions that will help you build small apps in no time!
Let me know if you need help or hints with anything, I'd be glad to help!