We've just bought a 180L upright freezer, and have 150L storange in our fridge freezer. We're starting to stock up as we have bub #2 due in 7 weeks.
I don't know whether you've done the whole freezer-cooking thing before, but I've found the following helpful:
-Use disposable containers if you really want to reduce work...less cleaning up
-Label EVERYTHING. Date, what it is, instructions on reheating/cooking. Anything you think you'll remember, is likely to slip your mind once you have a freezer full of food.
-Make a list of what you've put in the freezer, and how many. Cross it off your list once you use it. That way you know exactly what's hiding in there somewhere.
Hope it goes well...I can't imagine how full on it must be with full time teaching, and a toddler on your own!