2) then integrate the peak area (best done by fitting with GL functions)
3) correct those areas for the cross section of element and core level, inelastic mean free path and your setup.
That's it ;-) Sounds simple, but XPS evaluation is quite complex as you have to take a lot of different effects into account. Sadly there are many publications with more or less drastic errors in their XPS evaluations...
The CasaXPS (evaluation software) gives a very nice hand instruction, which is probably easier to start with than normal publications:
One more thing, for the future I would recommend to either to some more research on your own (you could have found all the links in this thread rather easily yourself). If there is to much information and you have trouble deciding which of the countless webpages, books etc to read that's totally valid, but please write this down in your question and also provide some more information on what exactly you what to do, need to accomplish...