Create a simple form in Microsoft Word 2007

I need a simple form with dropdowns and check boxes as well as text fields to populate a letter (not to be mailed). Example: Letter would read: This is a 20 year old male with brown eyes, black hair, etc. I want to be able to just fill in his age, select "brown" from a dropdown menu, select "black" from a check box with severak options, then generate a letter as above. I will need to be able to improve on the form myself. I just need the basic form and know-how.