That was fun. Now we wait.
The NBA offseason has a few different phases.
First, once your team has been eliminated from the postseason (or worse, fails to reach it) your own team's offseason officially starts but the playoffs continue and very few transactions occur (unless you have a coaching change or a rare trade during the playoffs).
The next phase is when the playoffs complete and transactions really ramp up. Trades start happening, the draft occurs, then free agency commences and things really get rolling. Silly as it seems, this is one of my favorite parts of the year.