how good to race at the nationals?

[clunk]

hi everybody,1st of all great website/forum jimmy.
i've only been racing 4wd off-road for about 10 months.i'd love to have a go at a national event later in the year,but am unsure of how good you have to be to compete? i have an f4 license grade for this year. do f1 and f2 drivers have prority for entries? how does it work?
i have done a couple of meetings this year and have out qualified and beatin f2+f3 drivers.
any help and advice is more than welcome,many thanks.