Go to your local Barnes and Noble/Borders/what have you, and pick up Nolo's book on will writing. Here's the link on Amazon:
http://www.amazon.com/gp/product/141...Fencoding=UTF8
I used this book (well, a similar book, earlier edition) to write my grandfather's will when I was 18. He had mostly liquid assets, some bonds, and some property. The will was contested in court by my grandmother (they were divorced). But thanks to Nolo, I'd written a will without any flaws
and the judge upheld it.
Hope that helps.