By all means get it now, if you can store it. It wont go bad in the freezer within a month or two before you are ready to feed it! Do you have a chest/standup dedicated freezer for raw? If not, I would highly suggest it. Even if its a small one. Why? Because that way you will always have room to store something long periods of time. For example, we got TONS of game meat this past fall...we are rationing it out so it lasts us throughout the year. If we didn't have the space to store it as well as all the other types of meat we have, we would have to had fed it all within a month or two of getting it.
And I do want to say that once you become an experienced raw feeder, your excitement will grow. You will find yourself an experience meat hunter and know exactly where and when to get certain things. You will feel compelled to help others switch over! But don't go into it too fast, or you or your dog wont be too happy LOL
Just take it slow and take gradual steps adding things in and you should be good to go!