1 of the following, preferably more but only one is absolutely nessisary.

1 1 04 sided die (1d4)
1 1 06 sided die (1d6)
1 1 08 sided die (1d8)
1 1 10 sided die (1d10)
1 1 12 sided die (1d12)
1 1 20 sided die (1d20)

Note: A 100 sided die (1d100) is purely optional. Rolling 2 d10's and having one equal the 10 space value is easier.

A peice of paper and a writing utensil to record character data on.

This is all which is absolutely required for play. Have fun.