If I cracked the screen on my iPhone 6, and I want to replace it myself for less than 60, what do I need ( I've seen on amazon)?

That has just like the outside and something called the LCD screen. What I want to know so I don't mess the whole phone up, what part do I need to replace and when I unscrew and disconnect the top, do it need to unscrew everything such as the camera, home button and all that like to transfer it onto the new uncracked screen?

There are youtube videos on replacement. Watch a few so you can see it from a couple different perspectives. You can get the screen off ebay. It will be the LCD/Digitizer assembly. Many of them also come with the tools you need. Mainly the special screw driver.
I have repaird upwards of 1000 iPhones and want to warn you. Be extremely careful. Watch those videos more than once. Many times people have come to me having tried to repair this themselves and they break it worse. It is not a difficult repair but it is also not difficult to make a small mistake that damages something else. Repair shops they do charge double what you want to pay (at least) because they have the experience and skill to do the repair without an issue.