Replying to MAC help

ALright so i need some help with my mac book. When the mac app store came out i updated and never ended up getting it for some reason. I thought it was weird but did not really care since i had no real need for it. However i really want to get it now and even if i update my comp it still doesnt show up. The reason i want the mac app store is so i can update from imovie to final cut x, however without it i cannot do it.

Any help is appreciated

And though it is inevitable please do not let this turn into yet another mac vs. pc shit storm to soon