You will need an etching kit and possibly some design software depending how complex the circuit is. Check the maplin catalogue: http://www.maplin.co.uk/productsearch?criteria=pcb+etching
Also, see these tutorials: http://wiki.altium.com/display/ADOH/Tutorial+-+Getting+Started+with+PCB+Design
http://fritzing.org/learning/tutorials/designing-pcb/
If you're designing a complex circuit, then your biggest problem is converting a circuit diagram to a pcb layout, so you should consider investing in pcb design software.