Here are my thoughts on the little information that you have given us. And so you know where I am coming from, right now I'm doing a Masters in Accounting & Finance, so i know a little bit about doing business and what it takes.
First of all, how old are you? If you're under 25 I wouldn't even think about starting your own business. if you're young you probably just don't have enough business sense to run a business.
Also, this "apprenticeship" you mention, well that's called getting a job at a bar. That's how most people who want to get into a certain business get their "apprenticeship" they actually go work in the industry/business for a few years so they learn how different businesses do things and then later take everything that they learned and start their own business.
Also, from the tax perspective, if you're grandparents happened to put your college savings in a 529 plan then you will have to pay deffered taxes and a penilty for using that money on anything other than an in-state college. So if it was a 529 plan, you COULD loose as much as 45% of the account balance (maximum individual of 35% + 10% penelty fee). of course how much you pay in deffered taxes depends on your tax bracket and how much your basis was, so it could be much less too.
So yeah, I think its a pretty bad idea, atleast from the little information you've given us.