you'll need:-
Micro SD card
Micro USB power supply
mini HDMI to HDMI converter
USB hub
hdmi cable
Screen
keyboard
mouse
Technical Specifications
1GHz, single-core CPU
512MB RAM
Mini-HDMI port
Micro-USB On-The-Go port
Micro-USB power
HAT-compatible 40-pin header
Composite video and reset headers
CSI camera connector
802.11n wireless LAN
Bluetooth 4.0
raspberry pi operating system download link :-
https://www.raspberrypi.org/downloads/