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It depends on how mutated you want your tanks to look, if you don't want them to look demonically infested tanks you don't have to use sculpting to make those tanks dedicated to nurgle, paint them up in a pale scheme add symbols and graffiti, plenty of grime, oil streaks and rust. of which there are plenty of tutorials from military modellers that can help. Forgeworld covered some of it in the first model masterclass book.
If you really want to go a head with the sulpting, to make pustules I'd use round beads of various sizes, glue them in place and sculpt around them, but it's not something I've tried myself so I can't offer much advice except look for some generic sculpting tutorials here on dakka and youtube to see how it's generally done, tools etc.
Also try looking for work in progress or project logs by people making nurgle armies, dakka's gallery is a good place as often you'll be able to go though the image to their profile and find the blog.
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