First of all why do you want to build a modchip in a wii these days.........a softmod is free, works with every wii console (Wii Mini only with hardmods) and actually offers you almost everything a modchip can do and more. If you still want to install it, everything you need to know is actually in the picture.
Also make sure your console is compatible with the modchip.
This should help:
https://www.d2sun.com/index.htm
You'll probably have to buy wire......but first I would just write to the seller to see if any are included (usually everyone who solders occasionally has a few supplies)
But as mentioned before it's actually pretty useless and I wouldn't recommend it these days..............