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This matters on what you need help with the most. In my opinion, Marketing is the way to go. However, I also think it might be a waste of money when there are so many opportunities to learn for free out there. Try this marketing course online for free from Wharton: https://www.coursera.org/course/marketing
Online-based learning offers free lessons and often in more precise topics, as opposed to broad topics such as Marketing, Operations, Accounting, etc. Here are 20 free options: http://www.lifehack.org/articles/productivity/20-places-educate-yourself-online-for-free.html