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@SplashAndrew in the beginning you will be tempted to go with thin picks like 0.46 mm or 0.71 mm because they feel easier to handle and don’t “catch” on the strings as much. I think that’s fine very early on as you are learning basic mechanics of strumming but don’t stay with the thin ones long. Within a few months you should start training yourself to use a thicker one.
As your strumming improves you just touch the strings with the very tips without digging in which is the proper technique you are typically looking for. I’m using a 0.96 mm pick now but sometimes I’ll go to a 1.2 mm.
The thinner picks are rather noisy (think “playing cards on a bicycle wheel”) so not only do you want to improve your strumming technique, you also want a purer sound without noise from a vibrating pick.
I’m a fairly new player, I’m sure some more experienced players will chime in. There are also different shaped picks and some with alternate gripping features. I’ve been sticking with the traditional “rounded pie shape” and have gotten used to it.