One thing that really helped me was to realize that I don't need a huge freezer stash built up just to go back to work. Actually, having a big freezer stash can sometimes cause a mom to reduce her supply, if you rely on it too much. When you start working, you always need to make sure your output is the same (or a little more is ok too) than your DC's input. So really, all you technically need is enough for your first day. Then you can pump during that day to feed the next, and so on. (assuming that you'll have opportunity to pump at work)
Now, most people don't want to cut it so close, so it is nice to have a little buffer in the freezer, in case your care provider dumps the milk on accident, it gets left out and goes bad, spill down your shirt at work while you are taking off your pump (this happened to me.... have an extra shirt and bra in your pump bag or car!), etc. But you can just add one extra pumping session into each day, and just start freezing that, even if it's just an ounce or two a day.
Of course, I know it's hard to find time to pump when you are home with your LO. My first pumping was after I fed my LO first thing in the morning, when he takes his morning nap. Prolactin levels are highest in the morning, and I'm always surprised how much milk I can get in the am right after a feeding.
Lastly, Kellymom and WorkandPump are the best online resources I have come across (in addition to MDC, of course). Good luck!