Class 2b = up to 201cc
Class 2a = 201cc to 401cc
Class 2 = 401cc onwards
There are many types of bikes.
Most young people like to ride sportsbikes, like SP, Kips, TZM...
Those are bikes have fairings, centre of gravity is front of the
bike.
For the Harley Davidson kinda bikes, like Phantom, Steed, Shadow,
Drag Star those are called custom bikes. They're heavy, harder to
turn but comfortable. Centre of gravity is behind.
Then you have naked bikes, like Super 4, Cagiva Planet... They look
like generic bikes, centre of gravity nearer to the centre of the
bike.
For long distance, you have tourers. Goldwing, ST11,... Those bikes
are very comfortable to ride, have lots of storage space but isn't
suitable for city roads. So get this if you like riding up
Malaysia/Thailand.
Here you can find scramblers too, the only name i hear most about
scramblers is KTM (Pardon my ignorance). They are designed to
handle abuse, dirt and grime, a very robust bike. They have good
pickup but not suitable for long distances.
Skippers are scooters, but look modern. Look at bikes like X9,
Silverwing... Aprilia offer skippers too!
Scooters, look at the vespa, retro and classy. Fit for the
ladies.
What else did I miss?