Anybody want to help a real beginner

Hi,
Im fairly computer savvy, however, know very little around DJing.
Ive previously done a few school discos (im a member of the PTA and to save the school money, i volunteered). THis was done using just my computer, iTunes and my creative inspire 7.1 speakers (yes, i know!).
Id like to beef the sound up a bit (well, alot!) and so ive obviously realised i need some beefier speakers and an amp. Im happying using the mouse/keyboard at the moment, although a mixer along with mixvibes would be fine to.
Thats pretty much where my knowledge ends. From what ive made out so far, when i buy the MixVibes Cross DJ kit, i get the software, a USB Sound Card and a MIDI controller to allow me to control the software. However, im stuck on the amp/speakers bit...how/what do i need to connect to the USB soundcard.
Would really appreciate any advice...ive been bumbling around websites/forums for a while now, and dont want to buy a load of kit that i dont need or wont do the job.
Thank you in advance.
Im fairly computer savvy, however, know very little around DJing.
Ive previously done a few school discos (im a member of the PTA and to save the school money, i volunteered). THis was done using just my computer, iTunes and my creative inspire 7.1 speakers (yes, i know!).
Id like to beef the sound up a bit (well, alot!) and so ive obviously realised i need some beefier speakers and an amp. Im happying using the mouse/keyboard at the moment, although a mixer along with mixvibes would be fine to.
Thats pretty much where my knowledge ends. From what ive made out so far, when i buy the MixVibes Cross DJ kit, i get the software, a USB Sound Card and a MIDI controller to allow me to control the software. However, im stuck on the amp/speakers bit...how/what do i need to connect to the USB soundcard.
Would really appreciate any advice...ive been bumbling around websites/forums for a while now, and dont want to buy a load of kit that i dont need or wont do the job.
Thank you in advance.