Reading the dvla website on getting a motorbike license is fucking confusing.

Am i right in saying me being over the age of 21, i can do my CBT and theory and jump straight on a 250cc bike? (33bhp max)?

I know i can do a course and jump onto a big bike, but i hear thats expensive and i would probably kill myself on something bigger.

Id like to start on like a 250 (thinking of the Ninja 250R or Hyosung 250 maybe) what do i need to do?!