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4" would be better. make sure the ground underneath is tamped down solid. 4" thick is 16 cubic feet of concrete. 3" thick is 12 cubic feet of concrete. I would do it in 6' wide by 2' long sections unless you have something you can mix a lot of concrete in at one time. Of course that would take longer if you only did a section a day. Concrete is heavy and it needs to be mixed well before it is poured. I think those 80lb bags are one cubic foot each. Man that is back breaking work. Getting the bags, hauling the bags, mixing the bags.
A cubic yard (27cubic feet) of concrete delivered by truck is usually about $200. Build your forms and just order the truckload to come and pour it in. That's the easiest. You could pour it 6" thick! A yard of concrete delivered is usually about $125 but there is always a delivery fee if you order less than 4 yards.
If you have access to a truck with a trailer hitch you could go to one of those ready mix places if you have one near you and get 1/2 or 3/4 yard in the you haul dumpers for less than a hundred.
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