seed ball distribution, chicken manure, and green mulch

i have three concerns with a summer project. my partner and i are running chickens over pasture to clear it. we want to remulch the cleared areas and distribute seed balls of support species, vegetables, medicinals, and woodies.

in what order do we place the seed balls, before or after, or in the middle of the mulch?
do trees get put down under the mulch while herbaceous ground covers go on top?
there will be a lot of nitrogen in the soil (too much in my opinion) between the green mulch and manure. should i be looking at hungry early succession species and slow-growing fixers rather than carpets of clovers and field peas and beans?

thanks!

frank

Seed balls first. Mulch after. How big an area are you planning?