welcome 2 the fam,
any mpc will do to make some tracks mate!
but if i was u and i wanted to start out djing you should get some decks and learn how 2 mix so it will give you a better understanding on how tracks are put togethet e.g intro's breakdowns,choruses etc.so when you do go to by a mpc you will have a better understanding of song structures.
well thats what i think n e way cause ive been djing since i was 12 years old,learned the basics and 10 years on im practicing for scratch comps.
i only discoverd the mpc 1 year ago wich was a bit of a biaaatch.cause if i had one of these babys when i was 12 i would be the beat master now. but i suppose you could say that im lucky to discover the mpc in the fist place!!!!! peace