Hi Gerri, welcome to DC. You are doing just fine! Relax and enjoy - we are a pretty friendly bunch here.
Vol au vent fillings can actually be quite simple. A classic is a basic "chicken pot pie" filling with small pieces of chicken breast or thighs in a gravy with small vegetables such as peas, carrots, onion, etc. You can even use frozen mixed vegetables.
I have also taken a piece of cheaper cut beef such as stew meat or round steak, cooked in a crockpot or covered in the oven with onions, mushrooms, a bit of beef stock and seasonings. You can even use BBQ sauce. If you do it in the oven, just make sure the temperature is low (250 - 300) and cook is slow and make sure there is sufficient liquid.
Any stew type filling works well.
Let us know what you decided and how it went!
"Variety is not just the spice of life, it is the key to life" - Chef Michael Smith