Hi Rae, I actually don't do much to these trees at all and they seem to take care of themselves. The one thing I do use which is totally organic, is a product called Atomic Grow which is an all natural growth enhancer of sorts. I can't really explain it well but you can read about it here:
Atomic Grow puts Mother Nature in charge
I had two volunteer trees pop up on their own growing in my compost. (planted them about a month and a half ago) I have no idea what variety they are but when I saw how big they were, just growing by themselves, I decided to plant them and see what happens. I will include pics of them so you can see how fast they've grown after I transplanted them.
They seem to flower just fine on their own and I did nothing to get them to fruit. I just use a palm fertilizer which is what I use on most of my yard except the citrus and avocado. It is 8-4-8. I use it on my naners too. I think the big time growth has been the result of the Atomic Grow though. As for how long before they are ready to eat? I have no idea.
Here are pics I just shot a few minutes ago:
