What do I need to replace cracked front iphone 4 glass? Verizon. What is the LCD?

The CDMA seems to be the Verizon phone. What is the LCD? Do i need my front glass to have that if I'm replacing it or will my iphone already have the old one for me to use?

Added (1). My boyfriend is helping me put the front glass on and he builds computers. Just not sure about the LCD

You need the tool kit. And its a much more complicated process than you think unless you are familiar and experienced with pulling apart electronics and putting them back together.

I recommend experience with building your own Desktop PC, or Opening and fixing Laptops.
Any other electronics is permitted.