I wrote this back in march on my facebook page....if you want a link to it, just message me.
get a decent glove! that's number one. then lightly condition the inside pocket. play catch with it. shape it between throws. store it with a ball in the pocket. never let anyone else put their hand in it. store it in the top of your gear bag so it doesn't get crushed. clean it regularly with a leather cleaner. clean and lightly condition it and place a ball in the pocket before putting it away for the season. When it starts to feel different, have it disassembled, cleaned (inside and out), get the padding re-adjusted and have it all re-laced. This may cost you $60 every 8-10 years but you still have your perfectly broken in glove that is customized to your hand and your style of play. That is priceless. It's better than laying down $200-$400 every few years and taking your chances with a new piece of leather.
Never do any of the following:
soak it (compacts the leather and ages the lacing)
oil it with a heavy oil...motor oil and such makes the glove dark and heavy)
place it in an oven (dries it out and will lead to early cracking and lace breakage)
put a rubber band around it (never wrap the glove because without a hand in it you are screwing up the pocket)
put it under a chair or mattress (it will fold under the pressure taking the path of least resistance and not best shape)
run over it with a car (are you stupid? the only thing you should run over with a car is a Yankee fan.)
play catch with a different sized ball (it effects the break points of the new leather causing less than ideal break points)
place it in the bottom of your gear bag. (it will get crushed, damp, moldy, and the leather will break down and crack)