For turntable choices I'm not an expert but a lot of people recommend older technics tables, direct drive if possible (meaning a little motor turns the record directly, as opposed to belt drive which has a motor turning a little rubber belt which turns the record). brand name won't tell you everything though, i mean don't pass on a dope sony table to pick up the crappest technics in the world..
if money is no issue then the technics SL1200 is kinda considered the go-to classic choice. but I'd just look all over craigslist and local flea markets, check any you come across on google to see if they're considered good quality or not.
i'd say try to avoid people that are like "i just found this under my bed probably it works" or whatever, best to buy from someone who uses their table regularly and has replaced the needle and maintained it over time etc.
for most turntables you need a "phono pre-amp" (there are different types of preamps, make sure it's specifically a "phono" preamp) to make the signal from the needle loud enough to sample into your MPC. DJ mixers often have this built in i believe. i just bought my first turntable and it had this built in so i can't offer too much help on specifics there.
i just googled and came across this page
http://turntablelab.com/pages/beginners-guide-to-turntablesSO yeah there's not anything else you really need though i guess, just a turntable and a phono preamp and your MPC and some audio cables. if you're going from computer-only to an MPC you might have to look into how you're going to play sounds from the MPC out of your speakers, and how you're going to record your final song into the computer at the end of the day too