OK here goes nothing.
1) Start Outlook.
2) Select the folder that has the names and addresses that you want to use.
3) Under "Tools" select "Mail Merge"
4) You get a popup that asks which contacts to use and which "fields" to use. I usually use "all" for both.
5) The same popup asks if you want to create a new document or use an exsting one. Select "new" if you haven't already written the body of the letter, otherwise select that. You also have to choose what type of document. It sounded like you wanted a "Form letter" so pick that. (You can also make labels or envelopes but let's stick with form letters for now).
6) Hit "OK" and Word will open with a blank page if you picked "new" or with the body text if you picked something you had already written.
7) In Word under "Tools" choose "letters and mailings" and click "mail merge wizard."
8) You should get a little mail merge bar on the right side that takes you through the steps. Go to step 3, "write your letter."
9) Probably you want the "address block" so click that. Also the "greeting line"
10 ) If you go to "preview your letter" you'll get what the letter looks like that goes to the first person in your contact folder that you picked.
11) If everything looks ok, click "complete the merge"
12) At that point you can "print" but I always do "edit individual letters" to check them. You get a popup that says "merge records" and this is where the fun starts. However many contacts you had in your folder, that is how many pages your Word document will be.
You may want to do a trial run with only three or four contacts to see if it works right before going ahead and doing a whole bunch.
Good luck and I hope this helps.