APR and other terms

I was hired yesterday as a marketing officer of a real estate company in Connecticut. I am still new to this business since I only graduated last year and I do not have enough experience in doing this job. Therefore, I decided to search on the internet and hoping I could find good answers. Can anyone tell original loan amt, term, note rate, and me what is APR, and how to calculate the dollar amount of fees and points charged as part of the cost of credit? How they are being calculated? It seems to be a very closely guarded secret, yet required by the government. Please someone help me and provide me a link that works where I can go and read it for myself. I would really appreciate your help. Thank you.