The tool rest will swivel so you won't need another one. For serious bowl makers, you can buy curved tool rests that will follow the contour of the bowl...very nice but too expensive for the casual user.
Can't tell you the screw size except to say that faceplates use common hardware screws that you can buy ANYWHERE dirt cheap so that won't be a problem.
I can't see any reason for an extra faceplate. Again, SERIOUS bowl makers might have extra faceplates so that they could mount up several blanks and work on different projects without having to remove and remount the bowls. This is not something you're likely to be doing. Most model work is "spindle" turning. In my case, 98% of the stuff I've used my lathe for is spindle turning. Spindle turning doesn't even use the face plate! In fact, I bought my wood lathe in 1993 and I didn't buy a faceplate until 6 months ago!
Yes. Calipers are the essential wood turning guage. Get a steel ruler to use with those calipers.
CHISELS. Hmmm. I haven't checked the Cdn Tire site. However, if there is ONE thing where you must go "high end", this is it. I'm not one of those guys who thinks everybody has to have the best of everything...people don't need Iwata airbrushes, Nikon cameras and Rolex wrist watches. But I've tried cheap chisels on the lathe and I've had disasterous results. I just can't get them to work. Think about the type of work you intend to do and you can pick turning tools based on your most likely projects. If you wanted a full set of tools for bowls and spindles, you could spend a ton of money. However, if planned to turn mainly smaller spindles, you could probably get going with a pair of gouges and a parting tool. Hey, it's almost Xmas...tell mom, wife, or girlfriend that you'd like that HSS Super-Flute bowl gouge by Henry Taylor Tools for only $126.00

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A bench grinder is a virtual necessity once you start buying machine tools. Things need to be kept sharp.
The thing to remember about cutting and turning tools is that they are ONE TIME ONLY INVESTMENTS. They aren't like models where you need to buy one every two weeks or digital cameras where you have to upgrade every year. If you spend $40.00 or so on a 3/8 spindle gouge, you will never have to buy another one as long as you live. Buy $200.00 worth of turning tools (better yet, like I said: Xmas presents), the tools will outlast your lathe, they will outlast you and they will outlast your grandchildren.
When I bought my lathe, and had trouble with cheap tools, I bought a good, big roughing gouge, a 3/8 spindle gounge, a 1/4 spindle gouge, a skew chisel and a very expensive fluted parting tool...and I haven't bought another turning tool in the last ten years!*
And the expense of the tool always has to be weighed against the savings in producing your own parts. This Spring, I posted pictures here of an "Orbit Jet" model that I made from wood. All material was scrap except for the paint and primer. A resin kit the same size is $130.00US and my model is at least as good as the kit. The savings on that single project alone cover the cost of a good set of turning tools.
*One thing about having a lot of tools is that you can make more tools

. I just got a small welder this year. A while ago, I made my first practical project. I took some old water pipe and some scrap metal and manufactured a specialized tool rest for my lathe.