My advice is, keep trying to gain experience at your local airport...check-in, or ramp.
To step straight off the street into the 6 week FAA Dispatch course is probably a sure fire way to struggle.
It really is a tough course and not cheap either.
Save up, and do all that you can to get grassroots experience. You will find that to be a godsend.
Just my opinion, mind you.
Good luck.