Thanks Berni.
Garage band and iMovie - both older versions. I just use the inbuilt mic in the mac which I am really impressed with.
The syncing can be a little tricky. I just drag the audio track which appears under the video in iMovie. You need to make sure the video is longer (at both ends) otherwise when you move the sound track it actually shortens it rather than moves it.
Now I need to get a video editor that allows me to include two videos in the one screen.
Will spend move time on this sort of stuff at some point.
There are many here who do this kind of thing so well.
The green screen stuff that UkeyDave has been doing is terrific.