When you create your profile, you don’t need to upload the actual evaluation. There should be a identification number that ICAS provides. You would need to provide that. That was the process for WES at least.
Here’s a link for getting your NOC:
http://noc.esdc.gc.ca/English/NOC/welcome.aspx
As for experience letter, ask your company to provide one with the job responsibilities since that is what is technically required.
This is a thread for new members where links to most of the important threads are available. Please go through this if you haven’t done so already.