if you keen to actually learn ride a motorcycle, that is if you had experience and working knowledge of how to drive a MANUAL (stick shift) cars, then get a 100-125 cc four stroke road motorcycle with 6 speeds, they are cheap to run and really teaches you how to ride, brakes are not fantastic and neither the power but you'd learn to respect the motorcycle, yourself and probably not the other road users, *wankers drivers, taxi driver,s old lady drivers, truck drivers, postal vans drivers(they the worst)...
but yeah when you actually understand how to accelerate adn downshift with blipping the throttle at rapid pace, (braking hard) and actually have ability to know how to down shit quickly without locking the brakes, and doing this often it builds up your confidence (and you better read the roads well too, oil spills, slicks, gravel, pots, uneven surfaces, paint on the road (they are bloody slippery in the wet(...experience is BIG on motorcycle riding...
then you may want to ease down on the gear-changing, and move up to bigger power, with more lazy gear shifting with more throttle power/impact that gives speed/and/or acceleration at will,...but you need to understand all this is with actual CONTROL (of yourself (speed greed, and willingness to brake) with this knowing the limits and how you juggle all the wick-on-throttle-when-to-brake-WHILE- reading-roads-AND-reading-traffic-and road signs then you'd know where to back off on from 250cc, 600cc or 1000cc..best for most is 250cc-400cc, but bigger slower revving can suit slower riders too...
so its all there just you got to start small, gain experience, try mix with those who actually ride motorcycle for sake of loving bikes, not images...
then you might be in the right crowd for the awesome experiences...
Good luck
once again, try go for geared bikes at least 100cc and no more that a slower single cylindar 250cc (4 cylinder are too hard to ride and it demands more pyche/understanding too stressy) want a 185-250 single cyling
maybe a 100-125cc to start with due to its less intimidating wieght, and the brakes will teach you to NOT be cocky...thus riding more sensibility for that all-important road survival
GOOD luck
oh if you get scooter, you'd get lazy, and soon forget real ideas of motorcycle unless you actually want to ride scooters...thats your choice...