canadiangirlUSRN

Hi, I am a Canadian citizen and obtained by BSN in the United States. I wrote NCLEX last week and have a job in Illinois. I cannot start my visa screen until I receive my license number. I am looking to get through the process asap so I can begin working. Also do I need to have a credentials evaluation service done (for those educated outside the US pursuing licensure practice in the US - I was educated in US but a Canadian citizen..) Also I got a letter from my employer however I don't think it is detailed enough. I was also told I must begin working within 5 days of obtaining TN status, does anyone know if this is true. I am thinking about buying a kit that takes you through the steps from this website http://www.tnvisaexpert.com/overview/tn-visa-requirements/ do you think it will benefit me? Any help would be greatly appreciated on this! Thank you for you time!