1) wiring is simply with or without a socket......... if you buy sockets you take a 2 plug wire just like the one coming out the back of your tv.... then you strip it and hook it up to the 2 screws on the bottom of the back end of the socket..... and if you want to do it without sockets you crack open the balast (between the bulb and the screw in part)and take the 2 plug cord and connect it to the red and black wire...
2)the two wattages on the box are actual and equivelent wattage the low one is actual wattage... thats what you go by.
kelvin is used to messure color temperature.... 2700 is more orangey (better for flower) and 6500k is more white with more blue light(better for veg)
2b home depot is a miserable option
http://www.e-conolight.com/Product/EFamily.asp the vapor tight comes in a 150 watt option for $20........ and the book is about cfls not HID..............
3 that is more personal preference than anything......
4 its not very hard there are hundreds of good ones on here... heres a really good one....
http://www.icmag.com/ic/showthread.php?t=100698
5 read multiple sources........ always with everything..... we have so much knowledge at our fingertips but neglect it...
6 once again theres plenty of that on this site.....
https://www.rollitup.org/marijuana-plant-problems/38772-guide-diagnosing-plant-problems.html
7 heres one of the best guides out there
https://www.rollitup.org/harvesting-curing/28072-harvest-time-tutorial.html
here is all the info you asked for....... this site will provide you with any infoyou need to know there are a lot of ppl here with a lot of experience growing some of the best cannabis around that are more than willing to help