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Hello, and first of all, thanks for the compliment and thanks for looking at my stuff!

The sizes and grounds depend on the support:

For stretched linen I use rabbit skin glue (usually one coat but sometimes two if needed) with one coat of oil ground (usually Gamblin)

For linen glued to panel, I adhere it with either PVA glue or some acrylic medium, then size the front with the same stuff. After that’s dry I’ll do one coat of oil ground.

For plywood panels, I usually just do many (5-7) coats of acrylic gesso with either a brush or hard squeegee (credit cards work well for this)

And for mat board, I cover it on both sides with one good coat of shellac. enough to fill up the fibers of the board but not too much so that it gets shiny and too slippery

and then when I’m painting in acrylic i usually don’t bother to prime anything, especially not paper

Hope this is helpful!

-Greg