I'm 30 and want to study Japanese in Western Japan, what school would be best?

I am 30 and during my recent holidays fell in love with Japan.

I have 5,000,000yen saved up. I want to study Japanese, but I don't know what sort of course would be best.

Many schools listed in sites like http://www.nisshinkyo.org/ are College Preparation courses - is this the sort of course I should apply for? Would I be too old to be accepted?

Or should I apply at a different sort of school?

Are there intensive, or some other business focused courses I should investigate?

I want to study somewhere not to far from Yamaguchi prefecture (Hiroshima or Fukuoka would be good).