Every number here is a working estimate to check with your building authority. Whoever prints this page takes responsibility for what is in it.
Materials and fasteners
Treatment, species and metals. 5 lessons.
The 6 in treatment zone. Change it. Find the wood that sits too close to the ground, then fix it. 
Treat every cut end. Change it. Put the treated end of this post where it counts. 
Cedar heartwood and sapwood. Spot it. Choose a post that will not rot at the ground. 
Fasteners that match the treatment. Spot it. Pick screws and hangers that survive treated wood. 
Which wood goes where. Spot it. Pick the lumber for the ledger.