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So I recently started working with greenstuff on a few of my minis and was inspired by a custom death guard squad (see picture). Does anybody know how to make leaves out of greenstuff like this? I couldn’t find tutorials anywhere.

They might have used something like this:

http://www.greenstuffworld.com/en/inicio/310-miniature-leaf-punch-punches.html

I don't have any tips either but the leaves in picture you posted are cut from Citadel Creeping Vines with some Sylvaneth Dryad bits thrown into mix.

Yeah they aren't GS. Also, if you're new to sculpting you should start with simpler jobs like minor gap filling to get used to using GS before you start trying to sculpt other things. If you have nurgle miniatures that's good as nurgle is forgiving and gives lots of opportunities sculpt wise.