You might find something useful from Tutorial: How to make a footprint in KiCad 5.1.x (From scratch)?.
Mostly you want and need Solder paste clearance. First, there’s the project value.
Most of the times you want some sane value there which is good for most of your components (for example 0402 or 0603).
Then each footprint has its own value in the Properties which overrides the global value. This is probably what you want here.
Finally each copper pad has the same property which overrides both the above mentioned.
And as Piotr mentioned, it’s possible to disable the pad layer for each copper pad and create “aperture” pads which have only paste layer and are independent. But mostly you don’t need them except when the paste hole shape is different than the copper pad shape. For them, see the tutorial and the “Exposed pad” example above.