I'd be interested to hear how deciduous trees are treated in Florida or Hawaii or other warm climates. Am also curious if Indonesia bonsai pros like Robert Steven have ideas.
Dave - are there any deciduous trees growing in the ground near where you live? Am curious if there are any examples in nature you can follow.
As for your questions:
1. One way to approach the seasons is to let a couple of trees - maybe not bonsai - grow and see what happens for a year. If there is a natural pattern, maybe you can follow that.
2. In general, deciduous trees produce new shoots after the dormant season and then slow down. When they slow down we start feeding moderately.
3. Green King sounds like a good fertilizer for the trees.
4. After the trees finish producing new shoots, maybe a few months after they start growing, the new shoots can be shortened. They are usually cutback again a few months later before they go dormant.
Of course, that's what we do in temperate climates. If you can't find advice for deciduous trees in a tropical climate, your best option is to experiment!