It depends if you want to learn it thoroughly; or just be a skid, and go c+p a program right after you learn a moderate amount of the language.
EDIT:
If you actually want to learn it thoroughly do what I did:
Study, and practice all of "Teach Me Computer."
Study, and practice all of TheNewBostons' VB Playlist (So you recap the content, learn more, and see different perspectives of the actual programming rationale)
Download source code (It's tempting to copy, and paste.. but don't do it) and dissect the code to see how it applies to the blackhat application.
Follow tutorials on simple malware.
By the time you do all that you'll fluently know visual basic, especially in the context of the blackhat world.
Good luck, and don't be a skid