This is how I make my meatballs and sauce :

Meatballs

300 grams pork or chicken mince
200 grams lean beef mince
a handful of grated parmasan cheese
1 tablespoon of basil (fresh or from a tube)
1 tablespoon of parsley (as above)
2 egg yolks
1 teaspoon of grated garlic
1/2 finely chopped onion
a little bit of seasoning to taste (I use vegeta)
and enough breadcrumbs to make into soft balls

I cook those for 15 minutes on each side on 180 in the oven.

For the sauce I use:

1/2 finely chopped onion & 1 teaspoon of garlic in a bit of oil in the pan
a jar of dolmio or similar
a good squirt of ketchup
a little squirt of sweet chilli sauce
1 small can of chopped tomatoes (or chopped fresh tomatoes if you have time)
a sprinkle of organo
a sprinkle of basil
a sprinkle of pepper and seasoning to taste.