Do you need memory aka hdd or memory card i have nethier and b4 i buy a game i wana know if il need 2 get a memory unit to play xbox 360 games?

You do not need one however, if you would like to save your games, then you will need either the memory card or the hard disk drive.

Normally, new models of the Xbox 360 on retail shelves will come with the memory card or the HDD so you shouldn't worry if that is your case.