Even though it probably seems simple, that's actually a pretty ambitious project to take on without much in the way of tools or experience.
Gluing up a slab isn't particularly complicated, but with a large one like that and a design that doesn't have any kind of frame or apron to secure it to, there's actually a lot that can go wrong. If your milling and glue up aren't dead flat and straight, any error is going to show up in the finished product. Whereas if you're making a butcher block counter or a table top that will be attached to a frame, then minor warping doesn't matter because it gets corrected by what its secured to.
Wood is quite strong along the length of its grain, but tends to sag without support across its grain. So I'd think about adding some sort of cross support underneath at a minimum. And if you do that, make sure you secure it in slotted holes to allow the wood to expand and contract.
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