Clean if needed, and dry well. You do not need to clean them unless you don't know where they came from or who handled them. IF you do wash, plan to air dry or hand dry well (TIP: spinning in a salad spinner will help dry faster), as water will cause the dreaded ice crystals to form faster in the freezer.
Slice pods into 1 to 2-inch pieces. You could leave them whole, but cutting into smaller pieces seems to help detract from the inevitable changes that occur in the freezer to the texture - when they're smaller, it's less noticeable.
Add to a freezer baggie, remove air, label, and freeze. Alternately, you can lay out on a cookie sheet, freeze for 30 minutes and then add to freezer container (this allows you to more easily pull a few out at a time if you need).
Notes
While they aren't as crisp as fresh, I've found the frozen peas still work well in these dishes:Stir fries - add them at the last minute (still frozen) and toss a few more minutes in the hot stir fry until they are warmed. Soups - add them frozen when there is just 10 minutes or so left to cook. Roasted on their own or in sheet pan meals - add frozen to a cookie sheet, drizzle with oil, season, and roast at 400 degrees for about 10 minutes, or until browning and cooked through.