You need to serve your time in short circuits first, before you can apply for your roadracing licence, then do a few road races before applying for your international licence, for the likes of the NW, TT, UGP etc.
Unless your somebody good, like Irwin, Jezza, Seeley et all.
Even SC racing is expensive.
Oh aye, SC stuff I'd have no problem having a go at and hopefully will get a chance to start next year, work permitting. Just don't think I could ever do the roads, as much as I'd love to!