Friday

What you need is a simple mixer and mic like this:

The Equipment Part 2 – A Microphone and Mixer

What you need to do next is borrow, or Hire a microphone and mixer. Usually around most schools they have one or two microphones, and probably a mixer. The native microphone on your laptop will not do a good enough job, nor the little voice microphones they include with sound cards that you plug straight into the computer.