I think you have missed most all of the new racer days this year. The last Bemsee one was with Focused at Brands on 21 Feb AFAIK.
That means you need to contact the ACU and go to Rugby for a classroom session. Cant remember if they do the eyesight test or you have to get it done privately.
I know there is a race school at Darley Moor that counts towards your ACU but if you have a road licence I dont think you need it.
Pay the fee. Get the licence in the post buy a transponder (dear) and a novice vest (cheap) pay your entry, get a bellypan if you havent already, lockwire everything.
Optional: frontal lobotomy
Probably forgot something but you are then ready to start making yourself skint.