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Preparation for a siting a shed

I currently have an old wooden framed greenhouse that is falling to pieces. The frames have collapsed and warped and I must take it down. I am considering putting a shed in its place. My question is, could anyone give advise on laying a concrete base for it to go on? At the moment the greenouse is just sited on random slabs with shingle. Is it something I could have a go at or should I get a professional in?
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Sheds aren't that heavy so the base doesn't need to be that deep. If the slabs in place were relaid to a decent standard you could use them as a base, probably cheaper than a concrete base. But if you decide on concrete you can do it yourself. You create a frame just larger than the area of the shed, fixed into the ground with wooden stakes, mix your concrete, 1 part hardcore 2 parts sharp sand and two cement. It should be 4 inches deep. You'll need a mixer, you can rent them by the day or week. However it's often easier to get someone in to do it for you. It's not a big job. Just be careful where you put it though, you can't change things once the slab is down, you can if you use slabs, and they are different to lay but easier to take up.
There are also plastic bases made from interlocking units which are quick and easy to lay.
Thankyou for the replies.