hiya, matthew, welcome to the site, sounds like you have some good ideas,
as long as it's rotted down compost, that's good to add to the soil, lucky you, to have a free source ;D
you can plant fruit trees and bushes this time of year, also, garlic and overwintering onins,
peas depend on the variety you pick, ours are about 4 feet hgh, happy digging :)