Most of us would have started this process by kick starting a parked bike in front of the house! On centre stand

I remember revving up too high the first time I kick started a bike, as a wee little boy. Nice, those memories. The first gear skill was all that was there to learning bikes back then!
Then there were days when we were tested by stuck in 4th gear and had to manage the bike back home in that one gear!
Enough nostalgia though, I see you are already in your path, and there are excellent practical pointers and internet leads in the thread. I would just add my thoughts on the topic.
To improve on ones skill there is no substitute to spending time hands on. The real world situations are myriad and only exposure makes you ready for it. The good old go around your colony routine or to go to the local shop, will definitely build up confidence to enter traffic zones. To remember to do the things you learnt at the right moments. And then to react to sudden situations thrown at you, without much panic. The panic, medically speaking throws you into the realm of fight (sympathetic) or flight (parasympathetic) or stunned muted response, with some mixture of anger and fear. The reflexes are dictated by this response pattern which is individualised. If flight is your pattern, only practice and conscious alertness makes you take the right decisions at the right times.
The final couple of seconds extra gained by staying alert differentiates outcomes in situations, small or big.
Anticipation is a big part of safe riding. You should anticipate the kid on his bicycle peddling with his ass off the seat, meanwhile in a funny conversation with his mates, his front wheel going all over the place. You should see the Aunty hurrying past the road, thinking if she does not look up to see then she is safe to cross the road. You should see the milkman on his routine routes who thinks he has laid claim on the path. The wayward boy on his fast bike who has not yet experienced broken bones.
And these are 200 mtrs ahead and they have not yet come to your visual horizon yet!
Your peripheral vision should be as busy as the central, picking up suspicious movements like a detective. You memorise patterns of behaviours to anticipate their moves, with a bit of basic physics involved. Nothing fancy in any of this. These are routine routine things, to some mundane. And to some returning home from work an awesome video game session!
And all this chatter in the biking brain should be deeply embedded in the auto pilot, with things running through it in real time.
Frankly, I think any of the sub 250cc bikes out their would be a good bike to start with. That is considering you know to ride a cycle and have some scooter experience. Only your finances and taste dictating the choice. All are easy bikes which would take not much time getting used to. Reliability should be a prime concern too.
First bike should interest you. Something which you can keep for sometime. If you can buy it, you can definitely spend on its minor repairs. If you end up mashing up a motorcycle I really think it is not entirely the bike's fault!
Probably a friend who can be straight up with you can suggest on what bike you should be avoiding.
Also a first bike has to be sub 250cc. As mentioned earlier, the cc has to be earned! Else what fun in upgrading?
I think RX100 is one of the easiest and most exciting cool first bikes to ride on. Depends on your age and taste. It has character, but that's what makes the learning better! It's one of the most handleable bikes, because of the combination of light weight, great balance and power when required to ease past situations. A right combination of learning but not being spoon fed.
It is different from the new age Japaneses bikes and would give a different perspective to ones biking experience. Of course, not if there is longer travels involved on regular basis.
Note from Support: Dots removed, typos fixed. Post spaced for better readability.