new to turntables.....need help

Hello! Today I picked up a Technics SL-D2 at a garage sale for what I think was a solid deal ($5). The player seems to be solidly built and plays nicely. Are there any upgrades my fellow members would recommend to help "improve" the sonics? New cartridge? Like I said, I am a "newbie" to the record world and if any A-gon members would like to offer a helpful suggestion, I am very appreciative. I am also willing to learn the hard way but I thought I would try here first!!