OK well let's start at the beginning. Grab yourself bannerbomb and install the the homebrew channel using hackmii and get yourself a softmod capable wii. You can then use NeoGamma loading it from the homebrew channel. Here are links to bannerbomb and the hackmii installer which installs the homebrew channel:

http://wiibrew.org/wiki/Bannerbomb
http://bootmii.org/download/

Here is a link to the latest NeoGamma:

http://www.mediafire.com/?4vzzxznzymg

Just put the neogamma folder from that rar in a folder called "apps" on the root of your SD card then you can load neogamma using the HBC. If you need any help feel free to ask but there are plenty of threads relating to bannerbomb and the HBC already on our forums so do a search first please

Once you have the HBC you can then use AnyTitleDeleter Mod to delete the duplicate weather and news channels and bobs your uncle!

http://wiibrew.org/wiki/AnyTitle_Deleter_MOD

You may want to look into installing preloader aswell so you can block any unwanted updates in future, but we can get to that later.