Coding commands should be easy as hell. That is, if you've ever taken a programming class. I thought I was good at coding before I took Java class, but they show you methods of coding that almost every languages uses.
If you've has experience, 2/10
If not, you could probably look at other...
On the Ipad it's a good idea, considering the fact that Most people buy seperate "tablets" to use with photoshop
But keep in mind they have already released Adobe Ideas, which is similar, just lacking major features like efects etc.
here are mine:
http://orangeurl.tk
http://orangearcade.tk
Also, file hosting websites are fun, but complicated. Could try making an email site.
And here's a great php script site for more ideas:
http://hotscripts.com
If you want to edit the layout you can change the images found in the webgallary (for phpretro)
If you want to code it... Just find an already coded one and edit it to your likeings