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3 x 3.6 m tin shed install - with floor install pls.

Hi, we will purchase a 3.6x3 m tin shed to be assembled. 2.1mH. One door. One of the cheaper ones off trademe. Looking for an estimate to assemble the shed, and, to make the floor to put it on - wood or concrete whatever is best. would need posts and joists as there will be fair weight going on it. I would buy the timber etc. So need like 12 piles not too deep, 4 joists? ply on top - and shed assembly. Good access, near flat ground. somewhere around where the photos are...