practise on a cloudy day, id never bowled medium pace in my life until one day it was quite humid and overcast, swung it in and out quite consistantly.
aim the seam between the keeper and first slip, and pitch it up high, aim around the 4th stump, and bowl above 60 mph, its bound to swing.
i always found inswing slightly more difficult to bowl personally.
I actually disagree with the cloud theory regarding swing.
As long as it slightly humid the ball will swing regardless if there is clouds or not (it will probably swing more if there are humid overhead conditions).
It is more to do with your cocked wrist position and how much backspin you generate when the wrist is flicked.
how do i flick my wrist if it is locked at 1st slip?
unless you mean flick my wrist to the right
I am a right handed bowler by the way