Noob trying not to break his car(1999), wiring help plz
 

Hey all I bought the mkturbo full kit which comes with pretty much everything including ms3pnp pro and an mtxl wideband. These are my first steps and I am intimidated by the wiring. I finally got the stock ecu out and plugged in the ms, but I'm not sure of my vacuum line placement(pictured). Also was I supposed to wire in the IAT?
The wideband needs switched 12v power and a ground, people suggest to ground where the ecu is grounded... where is the ecu grounded? What wire should I use for power? Do I need to use the stock o2 sensor plug for anything or can I just disconnect it from the sensor and leave it?
If anyone has a 99-00 or similar car can you send pics of all wiring involved please? I know "hold my hand." Please explain like Im 5 because I am not a mechanic. Thank you for any help
https://cimg4.ibsrv.net/gimg/www.mia...c07ca547c2.jpg
https://cimg5.ibsrv.net/gimg/www.mia...5dea2efaa5.jpg
https://cimg6.ibsrv.net/gimg/www.mia...086bcda384.jpg
https://cimg8.ibsrv.net/gimg/www.mia...1aba74b684.jpg
https://cimg1.ibsrv.net/gimg/www.mia...d4f9440047.jpg
https://cimg4.ibsrv.net/gimg/www.mia...94bd0d52e8.jpg
https://cimg6.ibsrv.net/gimg/www.mia...def8e0ba46.jpg
https://cimg8.ibsrv.net/gimg/www.mia...6596959351.jpg
vaccuum line placement
https://cimg0.ibsrv.net/gimg/www.mia...520e63fd6c.jpg
o2 sensor plug
https://cimg1.ibsrv.net/gimg/www.mia...be4e85d638.jpg
https://cimg2.ibsrv.net/gimg/www.mia...a627aa19a2.jpg
where I'm running lines/wires