Kali linux install process

Sir mujhe kali linux apna pc me install karna hai toh kya koum sa kali linux download karna hai or agar main kali linux apna pc me install karta hu toh kya mere hard disk wala sara data erase hoga kya mere pc me 8 gb ram or 500 gb hard hai toh jab main install karunga toh kya direct install me details mangta hai kya ki kitna2 ram or hard disk ko divide karna hai plz bataye