Do a bit of home work, go through some back issues of View Camera and read some posts on the net. Find someone with the type of camera you are moving up to. A minute with a master is worth more than reading a thousand books. And there is noting like jumping right in then finding the answers later. That's the most expensive, in time, which is the least available for most.
How about a Calumet cc4x5? Some sell with a lens for the same as without. Some sell with a lens and a case and some holders. Look on the eBay, you should be able to come up with a nice kit for a small amount. It's not like decades ago where you paid full retail price or bought the scarce used equipment.
and Good luck
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