[Crex]

Elliot, first off - thank you for your service. Most larger circular saw blades have steel in them that will do service as a knife that will cut, however getting the most out of the steel for cutlery purposes (what most of us strive for as knifemakers) usually requires more knowledge about the type of steel and what thermal cycling is necessary to achieve the best results. No doubt that you will get a serviceable cutting instrument from that saw blade as long as you do not overheat it during the grinding process. One thing you may have issue with will be drilling holes for pins without softening the steel.
It is always good to hear that someone such as you has the interest and desire to make a knife/knives. Never feel that any questions you might have are not relevant so always ask.
Another recommendation is to find a knifemaker near you and spend some time with him/her in their shop. Well worth the effort. Fill out your profile, you may find there is someone right around the corner. Also check out local and state wide clubs and organizations, most all welcome newbies and beginners and will help you lighten the learning curve. There are knifemakers everywhere just have to do a little looking and asking.
Best of luck in your endeavors. We are all here to help and learn.