As you said you have been through the CIC website, I am not sure why you cannot find the link to the application process, but I have put it here for you.
http://www.cic.gc.ca/english/index.aspWas the university your husband earned his degree at a recognized educational facility before it merged? Go online and do the practise tests for IELTS so you are well prepared for the test. Book it early as it can take several weeks/month to get a seat and the results take another 13 days.
Without indicating which NOC you will apply under, it is impossible to guide you about it meeting the CAP, but I suggest you follow the thread "Applications after 26/6". They have made a spread sheet including projections for each NOC till the end of June 2011.
How to ask your employer for a letter? All depends on your present relationship with him, but always helps to tell him your experience in his/her firm has been positive for you. State that you are preparing to emigrate to Canada and would appreciate his help with the most important aspect of the application. Take a copy of the information required (NOC duties), perhaps draft a list of your duties that are relevant to your job and that NOC so that he doesn't see this task as "more work". Tell him that it is a time consuming process and you look forward to continuing to put your energies into your job.
Good Luck!!