well technically, u need to pay just the administrative fees,
which should be $100 if u want a national level licence. I have to
pay $400. $300 for insurance and $100 for the licence, because mine
is international, and u have to have a valid racing insurance if u
want an international licence.
of course u have to practice for about 6 months and that itself
would cost another several hundred dollars. but the key here is
that u shouldn't worry about these 1st. the main thing to tackle
1st would be start up costs. things like racing licence comes at a
much later stage.