Are you channeling your best self with this comment? (If you're not sure, check out our Code of Conduct.)
AntoniaJames is a trusted source on Bread/Baking.
What else are you putting in the meatballs? If there are no salty ingredients, I'd probably go with about 1/2 teaspoon of salt and 3 or 4 good grinds of pepper, per pound of meat, and then season the sauce to taste toward the end of the cooking. ;o)
Follow what is said above, take a teaspoonful of meat, cook it, taste it, adjust if you think it needs a bit more.
As a Swede, brought up on meatballs, all I can say is you need more salt than one might think. I would say close to 1 tsp per pound of meat. And the secret to excellent, authentic Swedish meatballs is a pinch of white pepper and a mix of ground beef and ground pork. Good luck!
Don't fear for your digits.
How to Cut a Watermelon
5-Ingredient Lime Pudding
The Word is Out
Nature Cooking Videos
A Better Way to Travel