If the pork is safe for human consumption (gov't inspected) you do not need to freeze it for 3-4 weeks because by law, any food fit for human consumption has to be de-wormed anyways. Any wild game does need to be frozen for that long, however.
Order however much you can hold, basically, lol. We order organs for 3 months out just to make it easier for us since the place we get organs from is a little bit of a drive. We get in on the co-op orders that are usually every 4-5 months (for my group anyways, might be more often in the bigger groups). Otherwise, we pick up from our local stores weekly because I live in an apartment and can't deal with that much meat. Thankfully we cook mostly fresh, so we don't need much freezer space. Can't wait to be in a house...that first purchase is sooo going to be a freezer.
Just don't let anyone look in your freezer, they might think you're a crazy killer!