Jeanne, I would recommend not putting them in the freezer unless maybe they've been air-drying for a few weeks as freezing when they still have some internal moisture could kill them. Or try it with just a few and keep the rest somewhere cool or in the fridge as a test. Freezing is not likely to contribute to breaking seed dormancy, so has no advantage other than long-term storage if successful, whereas temperatures just above freezing do (if the seeds are hydrated enough).
The rule of thumb for depth of planting is twice the depth of the seed, although outdoors you can go a little deeper than this. I wouldn't go any deeper than 1" at the most.
