Writing skills are best learned through practice, critique, and revision.
Curriculum is a waste, in my opinion – that is, listening to generalizations about how to write something other than the task at hand. Only the actual words on the page are worth discussing. Not rules.
Maybe courses would be worthwhile if they entail a lot of hands-on interaction with a brutally honest, pragmatic instructor.
What your team would really learn from, I suspect, is watching someone perform surgery on their copy, pausing to explain why the guts are being ripped out here, why the sutures are stitched up in such and such a manner there, etc.
Consider hiring someone to workshop in person with your team. No prearranged abstract curriculum. Just critique.
Neville Medhora - Kopywriting Kourse.
I hung out with Neville in 2013 in Seattle. This guy is a master of what he does.
Even if you can't apply his techniques directly to your business, it will really reshape how you attack your copywriting.
Follow his newsletters - you will find yourself reading them to the end more often than you would like. He pretty much helped AppSumo kick arse for years. He also helped another of my friends whose now in Y-Combinator smash his email marketing conversions.
You'll be taken to a Facebook group.
Very active. Loads of expertise.
Pinned offer at the top by the founder.
I've been studying & writing copy for 20 years. Started with Dan Kennedy before he got really famous (good partnership with Bill Glazer, that one), Caples, Ogilvy. Learn the fundamentals.
Are you doing B2B, B2C or IM sales? Each requires a different voice; for example, use the ultra-hypey IM voice for B2B and they'll run away so fast it'll make your head spin.