Please Help

[Brennan]

Hello everyone. I just started using AutoIt yesterday and I've been working on a script that automatically purchases a piece of clothing. This is what I have so far:
 

Call("addItem")

Func addItem()

ShellExecute("chrome.exe", "http://www.supremenewyork.com/shop/all")
Sleep(250)
MouseClick("left", 855, 508)
Sleep(200)
MouseClick("left", 1129, 703)
Sleep(100)
MouseClick("left", 545, 474)

EndFunc

 

This script opens chrome and goes to the website http://www.supremenetwork.com/shop/all. Once it goes there, it selects and item and clicks checkout. Now, I just need the script to automatically fill out the information (name, address, etc.). I am not sure how to do this. Can someone please help?