I usually make begetable beef soup in large batches, but I think you can get the info you need from my recipe. I wouldn't worry about equal amounts of veggies. I always end up with half-bags of something that get tossed in.
Vegetable Beef-Barley Soup
1 lb beef
6 c water
3 tsp beef bouillon
1 bag corn
1 bag mixed vegetables
1 bag green beans
1 bag peas
½ c barley
3 potatoes, cubed
46 oz V-8
Beef may be from a bone, stew beef or cut from a roast. Trim fat & slice small. (Easier if slightly frozen.) Cover beef with water & simmer 1 hour. Remove bone & dice meat if necessary. Add bouillon, veggies & any seasonings desired. Bring to a boil & simmer at least an hour. Add potatoes & barley. Simmer at least ½ hour. Add V-8 or tomato juice & serve when warm. Freezes well.
When we were kids, my mother used to put cabbage & broccoli in too, but my kids didn't like that when they were younger.