There are many, many ways to do it.... the lawyer at my institution encourages EB1Bs to DIY without any input from him or anyone else, so that each package looks unique, tells your own story, and does not look like you are using a boilerplate or template from others. In his view, the more unique it is, the more you will stand out, and that is the whole idea.
For my packet, I did it a bit differently from most in this forum. I told a "story" of my research, emphasizing international recognition for each piece in the story. My cover letter described each important achievement in my career as a timeline, rather than just counting things up. The evidence then followed this pattern as well.
For example, something like:
In 2001, Dr. WaryOR completed a research project which showed that ABC was related to XYZ. This was an important finding because it was the first time that XXX. As noted by Professor GHGH of the University of Other Country in his attached letter of support, "This finding paved the way for other researchers to understand how ABC relates to XYZ, and blah blah". The findings from this research were presented by Dr. WaryOR in a plenary presenation at the annual Yada Yada meeting, attended by researchers from over XX countries. The manuscript was published in the Journal of YYY, the leading journal in the field of ABC, with circulation in over XX countries. As further evidence of the international impact of this research, over XX researchers from YY countries have cited this paper.
Then repeat for your next significant finding.
Keep in mind, everything you do for the OR category has to show international recognition. If you have a paper that has never been cited by anyone from outside the US or your home country, it may hurt you more than help you.
If you have ever received requests for reprints of your papers from foreign researchers, this is evidence that your work is of interest to others internationally. Keep all those requests.
I included a complete copy of my papers where I was first author, and the face page of the rest. I did not include papers that cited my work, just the printout from ISI of the papers that had cited me. I also printed out lists of the countries from which those citing papers had come.
(In ISI, you can actually select which fields you want to display in your listing, one of them is country)
For an OR package, everything has to demonstrate that people in other countries know about your work and consider it to be important. Read some of the AAO decisions on the USCIS website to get a feel for this-- it is different from an EA or NIW case where you are trying to present the same content, but in a different way.
Good luck!