Ok sounds good... in zone 8b, its time to get some transplants in the ground soon... If I did till this first year, I would not go deep 2 - 4" is good... the compost would be great as long as the leaves and greens are broken down. If the leaves not full decomposed, they can still be used for top mulch after the plants are 8" or taller to protect the soil from the sun... It will be very important to make sure no soil is left exposed to the sun... What's growing in your area now?