Fall garden and seedballs

In a month, it will be time for me to start my Fall Garden. (Zone 8aish) Here is what I'm thinking of planting:

1. squash
2. beets
3. broccoli
4. Brussels sprouts
5. Cabbage
6. Cauliflower
7. Carrots
8. Collards
9. Cucumbers--pickling
10. Kale – lots and lots of kale
11. Kohlrabi
12. leaf lettuce
13. mustard – lots and lots of mustard
14. radishes
15. spinach
16. southern peas

and "deer plot" seed as the accompanying nitrogen fixing plants.

I'm thinking of trying seedballs (with a bed or two planted with kale and mustard sans seedballs as a security backup since I've not tried seedballs before) and was wondering which seeds I should combine together in the balls?

I was also thinking of trying to seed my lawn AND the area where I will be putting out the seedballs in with a cover crop of either buckwheat or vetch but I'm not sure the buckwheat will have time to mature... is there something I could at least cover crop my lawn area with that won't need a bushhog to cut?

Edited to add: And, questions about the seedballs:

what kind of clay should I use?
the permie video I watched said to include compost...can I also include rock dust and dried molasses or just stick with the basics?

I use annual winter rye for fall grass. it greens up the pasture and gives horses and sheeps grazing through winter. Texas. Its gone (and not needed) by this time of year.

I have great luck with it. I throw it out after a rain so it sticks to the moist ground. I never seedball or rake it in. I time it when the hurricanes bring rain to my area.