Casual, Formal, European.
It can be elaborate or simple depending on your style and theme.
Here's the basic place setting I use and you can build from there.
I like to use chargers and/or placemats. Forks go on the left, knives on the right. Be sure to use the dishes that are appropriate (i.e. salad plate, bread plate, spoons, bowls) depending on what you are serving.
Also offer wine glasses and a water glass.
For a more formal feel, I put the napkin on the plate but this can easily be switched up and placed under the knife.