General Midi, newbie question Options

[stalked]

Hello all, muchos help needed, im currently studying a music technology course and have been told I must create a composition entirely using general midi. I understand the basic background to this term general midi i.e. protocol set up so all could have standardised format etc. What I would like to know is are there a specific set of sounds that are regarded as the general midi and if so where can I get a set of these. Im using cubase SX with an iBook and an evolution ekeys USB controller/keyboard, as you probably know this contains no sound of its own so what are my options? am I off out to buy a midi sound module, if so which is best/cheapest? or alternatively can I download a patch/set of sounds, I think there must be some kind of in built set with the iBook as i can play midi files, am I wrong? (wouldnt be the first) if so how can I access these through cubase? Just started using Cubase so loads more questions there but i'll have a go at those myself if I can get this sorted
any help would be top
cheers