Need help formatting info from Excel into Word

I have a list of people I would like to send letters out to, but the problem is that they are on Microsoft Excel and I want to stick their names and addresses on each row on my marketing letter so that I can mail the letter without printing labels and stuff them into an envelope with windows to expedite mailing letters. I just don't know how to do it. If someone could help me do this, as well as turn all the content in Row A into my marketing letter where it says "Dear..." and turn it into a personalized letter rather than a generic letter. If you could make a program or teach me how to do this if it's easy and I just don't know how I would pay for this knowledge. I would prefer a program. It doesn't have to be complicated, something simple for a guy without a lot of computer knowledge, this way in the future I can update the information in the future.