The city has a chat where you can talk to them, or call them. They won't tell you exactly what to do, but can give you guidance. I don't believe there is specific requirements for things like 2x8 vs 2x10 for a deck from the city, but you could search for recommendations. It will be the same here as elsewhere for safe loading.
Those pyramid things are probably no good, you will need piles. I believe you can use screw piles but that will add to your cost. If you have to dig holes, save yourself the suckage and rent a gas post hole digger. You will need a friend.
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