[billsreef]

There are commercial defoggers available at most dive shops. Also spitting in the mask and rubbing it around real well, than lightly rinsing will work well.

As for the ears, you need to learn to equalize. Basically, as soon as you start descending, pinch your nose and blow till your ears clear...repeat often. Generally on ascent your ears will clear by themselves, or sometimes just wiggling your jaw a bit if they need a bit of help.