Since you dont know how to ride, I would not suggest a 150 bike. Safety over everything else.
If you still want a 150cc bike, then fine....your risk
Or dont buy a bike right now, learn on an old bike (maybe dad's uncle's friend's

) and become comfortable riding a bike in traffic.
Then buy a nice 150cc bike.
If you want to buy a bike now, I would suggest the Gladiator 125. Briliant bike, very refined, comfortable too.
This is my sincere suggestion..... I kind of forgot abt you not knowing how to ride.