Not enough information.
Let's say you want to keep your set to 400 chips (which is pretty small, but might be adequate). 8 people buying in for $100 at a time, maybe your total amount of money on the table at the end of the night hits $1600.
60x 0.50
100x $1
200x $5
40x $20 or $25
Total bank $1930-2130. As the game grows, add $5s and $20/25s as needed to increase your bank. Even if you go to 10 players, you won't need more than 100 fracs, but you should look to increase total chip count to 500 or 600.