I'm very to new to bonsai (and am already hooked). This is my first post in fact

Anyway, I bought this little fig bonsai which is apparently 28 years old, though it had been in a small pot for about 8 years without being re-potted. It naturally defoliated over the winter, probably due to my not watering it correctly. When it started dropping leaves I moved it into a larger pot with fresh soil, though only loosened up the roots at the base as I didn't want to do a proper re-potting over winter. It's starting to bounce back now but clearly is going to need a lot of work.
I want to wait for it to get more vigor over spring and then re-pot it late spring / early summer. Once that's happened I want to focus on ramification, branching and reducing the height of some of the branches.
Does this sound like a good strategy?
The branches are quite woody so if I cut them back, will the branch out from the woody parts? Is it safe to cut back all of the branches at one or should I do a few at a time?
Any advice you can give would be greatly appreciated!