On the Dillon progressives - the shell plate is also the shell holder. "Shell Holder" generally referrs to a single stage press (switch shell holders to fit the case heads of different rifle/pistol calibers).
You don't need a single stage press or a manual priming tool to load pistol ammo. No need to decap pistol brass in advance either, unless you are processing military brass (with a crimped primer pocket). A single stage press may come in handy down the road, however. For example, I resize most rifle brass (especially .308 or larger) on a single stage, rather than putting that stress on an aluminum frame Dillon. Actually, I even resize .223 brass on the single stage, even though it's not really necessary to do so.
When I need to decap (only) in advance, I still do that on a Dillon 550 or a 1050. It's easy to up a seperate tool-head on the 550 (with a universal decapping die) for that.
You also need case gauges for setting up your sizer die(s). Optional, yes, but good to have.
Good choice on the Dillon Die set for the 550, btw. They are designed for progressive loaders(especially the sizing die). Be sure to read (and re-read) the setup instructions.
I always use calipers to set COL - even on my pistol reloads. Get something a little better than Harbor Freight or just go whole $hog and consider it a lifetime investment. I still have and use an older (less expensive) set of Midway digitals, even though I also have (and use) a nicer set of Mitutoy's. (The Midway calipers now stay in the garage next to my case trimmer.) The two read within .001" of each other.
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