Its super easy. The amount of ingredients is set for 6 people, but you can make more for a bigger crowd. Just remember its basically 1/4 lb of ground beef per person.
3 lb ground beef
1 cup ish Italian bread crumbs
½ cup ketchup (plus some more for the top of the ketchup)
Mix ground beef, Italian bread crumbs, eggs, ketchup. Mix with hands and pour in 8 x 10 dish.
Cook for about an 40 minutes (not raw in middle). Pour ketchup over meatloaf and cook for 10 minutes.