Development of wii home brew apps is both fun and challenging. If you wanna develop app for the wii you will need some things.
Your going to need to be very determined to make a good app.Don't believe me see here Homebrew_Channel Team Twiizer has been working on this for at least 6 months.So determination is key.
It takes a while to completely debug a app so be ready to debug a lot.
You need to know at least some code.C++ is a good start and the language the wii uses.
A good app always starts with a good app.
It takes time to make a good app for the wii.
If you have these thing then what are you waiting for develop some apps already!