Use good quality freezer bags (this doesn't necessarily mean name brand). Just check to make sure that the bag feels heavy and thick in your hand and that the seal works very well.
It's so easy to use the type of bag with the zippers, but I've had more bag failures with the zipper bags than with the press and seal type bags.
Buy yourself a sharpie marker to keep in the kitchen in your "junk" drawer OR tape it to the front of your freezer bag box. Then you'll always have one.
The flater that you can make the bag, the better for saving space in your freezer.
When putting things in the freezer, put the newer things on the bottom of the stack so that the older things are near the top and you'll use those first.
Squeeze air out of the bag after you put the meat into the bag by rolling it up. Air in the bag will equal freezer burn later.