You will need
Supercharger (rotex c30 94)
Supercharger brackets
Megane injectors and plugs
Intercooler and pipework
Uprated MAP sensor
Airfilter
Restrictor (low boost)
Remap
There are two main kits one from KTEC which uses a standalone ECU and the kit Craig has from RSTUNING which is mapped on the standard ECU but comes with pro alloy rad and intercooler.
You can buy the KTEC kit and fit it yourself in about 6 hours, as far as I know the RSTUNING kit is fitted by RSTUNING and not available in a kit form. They also use a different bracket for the supercharger.
This would be for a low boost set up which will give you around 250 bhp and 225 ft/lb.