How to create a simple DVD with menu and a set of scenes (on a mac)?
iDVD should have come with your mac. Give it a try.

iDVD is a very basic DVD authoring tool (a category that is distinct from video editing, though authoring tools may be bundled with some editing packages). I've only used it a handful of times, but I'm fairly sure that it does everything that is requested here.

One thing to keep in mind is that DVD authoring is very much an art. I can't offer much specific advice other than the observation that different DVD players react to different Codecs in their own ways. Single-layer DVDs are relatively easy to author, but if you get into making dual-layer DVDs then you need to do extensive testing to ensure that your discs will actually be playable.