[Planologer]

Since you are just dipping your toe into TG stories, I would say start with posting to Fictionmania. It is a TG fiction storysite. You wont make any money doing so, but it is a good place to get feedback and improve and you can use that to build up cred so that people know the quality of your work when you do move on to amazon.

As for what I like to see? Total body transformation, but leave the rest of reality and the mind alone. If the man is mind controlled into acting like a girl, or is turned into a dumb bimbo, then we lose out on the one unique aspect of the person after the change: a man in a woman's body.
Changing the rest of reality so no one else remembers that the girl was ever a boy is similarly cheap, because it removes virtually all conflict from the change.

I am also a fan of stories where it is possible for multiple people to be changed, such as a contagious TG disease or a drug that can be poured into a bowl of punch at a party.

My two cents.