As you'll soon discover, LF is an entirely different thing than the smaller formats. At least for me, it was like I could play trumpet, and I was moving to saxophone. What I knew about music helped, what I knew about trumpet was meaningless.
That said, I found it well worth pursuing. So worth it in fact that I no longer do any small format photography. Sold the equipment. My 5x4 is my only camera now.
People are harping on the weight of the old Calumets because they are really heavy. Weight means more in LF, because as the film size scales upward, so does everything else. And in LF there are no zoom lenses. You'll be using a handful of "primes" each of which takes up space and contributes weight. Similarly, just about all LF photography uses a tripod. And just about all tripod work uses a tripod head. More weight and more weight. I'm just sayin' that the weight issue is a serious one.
The old Calumet monorail cameras were meant for the studio. You mount it on a studio stand and roll it where you needed it. Fine in a studio, but hideous beyond the studio.
So... it all comes down to what kind of photography you are thinking of doing with LF. If you want to photograph sports, current events, or do portraiture, you might be better off with an old press camera like a Speed Graphic. These are designed to be used hand held, but it's not as easy as using a 35mm SLR. But they can also be used as a conventional "field camera" also -- mounted on a tripod and focused through the ground glass. This level of versatility is why many people start out with press cameras.
If you are going to do landscape work, you'll probably want a field camera. These are lighter, and fold up for easier packing. Just about all require a tripod to use.
If you are going to be working inside doing table top work like still lifes or product photography you may be happy with a monorail. Maximum flexibility and precision if you want it.
Few LF cameras come with lenses. The exceptions are often press cameras and many times people are selling whole kits which include camera and lenses. But any lens from any lens maker will work with any camera (once you fit it in an lens board appropriate to the camera). LF lenses often include shutters. You may OTOH want a barrel lens without a shutter. You'd want this if you were using a press camera that has a focal plane shutter, or an 10x8 or larger camera where shutter speed is usually in the multiple seconds (and you just pull the lens cap off and replace it to expose the film).
Clearly there is much to learn and much to consider. Pick up a good book on using a view camera (there are a bunch), and look at the
LF photography forum pages (there are a bunch of useful articles). Then come back and ask more specific questions as you need more information. LFP.info and APUG are extraordinarily good resources with a lot of really nice and helpful people willing to help.
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