The odds that you'll get the "right" camera for yourself for the long run on your first purchase are slim. No matter how much advice you get, you won't know what suits you until you start trying cameras for yourself. And I don't mean fiddling in a store somewhere, I mean actually using them to make pictures for a while.
By all means, get advice to learn about the different options that are available and to rule out any cameras that are grossly unsuited to what you want to do. Beyond that, though, just buy something and dive in. BTW, the likelihood that you'll eventually want a different camera is a good reason to buy second-hand, so you'll avoid the depreciation that comes with being the first one to resell a camera originally bought new.
FWIW, I started in LF with 8x10. I think contact prints are magic. If that's what you want, and if you can afford it, don't feel obliged to use 4x5 first. Life is too short.
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