Good answer from Joe and ...........anyone who can't take onboard what's being said would go nowhere on one of these courses and gain nothing from them.
Marketing courses are all about role laying, being led up dead ends, having to come to conclusions and knowing when you need to ask questions also, knowing who to ask.
Yes, you could gain from it information which could help you in your c/c business, but you will find the answer to just about any question you have about marketing on here, or be directed to companies who specialise in c/c services marketing.
If you want Marketing as a career than by all means go to college or uni and spend a couple years studying for a degree, but you're then becoming a 9-5 suit, which is fine, if it's what you really want.