I say do both!
Hey there, same boat as you...opening a brewpub next year....
I started getting serious about brewing education about 18 months ago, reading everything I could get my hands on in order to prepare for the next step...
After about 6 months of reading up to not look like a total newbie, some serious homebrewing, etc...I took the plunge and starting hitting up brewpubs and micros, making friends with brewers, and visiting and examining brewing facilities in the US, UK, Ireland, and Japan.
6 months ago, I took a course at Siebel, and immediately discovered that while my studies had built a firm foundation, I needed more concrete the for big building I wanted to make. I'll be returning to more classes at Siebel this fall...
Finally, 2 months ago I started working for a micro to start getting firsthand experience. This has by far been the best insight into my future as a brewpub owner, and if you get the chance, I say go for it.
I always shy away from online courses, I sort of figure that if you're sitting in a classroom, you're going to soak up more through osmosis than just sitting at your computer. Also, you get to engage the other students in conversation...something I found to be very insightful at my course at Siebel.
Just my 2 yen...
www.devilcraft.jp
www.japanbeertimes.com