If you want to understand A4V/R4V then go here and visit the forums and listen to the audio classes (100s of hours worth):
http://www.creditorsincommerce.com/
Success is highly dependent on your level of commitment and education. This isn't some quick fix or silver bullet. You need to have a thorough understanding of administrative procedure and processes as well as a complete understanding of the foundations and procedure of A4V. Don't expect to mail an a4v in and the company in question just to say "oh, OK thank you". If you can't enforce it, you will get yourself in a heap of trouble real quick.