Ok.
Firstly. You don't need Twilight Hack as Banner Bomb is much easier and compatible with all Wii's.
There are a heap of good Guides out there that will walk you through this step by step. My two preferred are:
ULTIMATE System Menu 4.0 Guide
[Guide] Fully Softmod Any Wii (everything you need), HBC + BootMii + NAND + New cIOS + PreLoader + Backup
Read both and make sure you understand them FULLY before starting. Ask questions BEFORE starting on anything your unsure of.
Remember, Bootmii and Preloader will save you if you make a mistake during the process.
Ultimately you want to achieve the following, in this order:
1. Bootmii installed and a NAND dump made and stored safely.
2. Home Brew Channel (HBC) 1.03 installed.
3. Upgraded to 4.1, either with Wanin's tool or officially.
4. IOS36 patched with Trucha Bug Restorer (TBR).
5. Prelauncher installed and relevant hacks applied.
6. cIOS 10 or 14 installed.
7. IOS60 patched with Dop-IOS.
8. USB or Backup loader installed.
The exact details of how to achieve each of the 8 points outlined above can be found in the two guides mentioned.