Cutom wad manager is required for some people to install cios_fix - it runs under ios16 which means when the normal wad manager refuses to run , the custom one can be used to install things after you install iso16
All of this is discussed in detail in different parts of the boards.
the c in cIOS stands for CUSTOM - thats all it is , a customised version of the normal IOS , usually to allow certain things run that wont normally.
You wont brick using any of the files i have in my zip with the exception of misusing any title deleter and it wont matter if you try them in any order - they will either work or error in which case you have missed a step or done something wrong
Wad are the biggest cause of bricking wii's to date - i stay away from them unless they are required.