If its a tournament you can start as little as you like and have it go up over time

e.g. start at 0.05/0.10 and double them every 20 mins or something similar.

If it is a cash game then the "usual" would be to have $0.50/$1 blinds so that you start of with 100BB.
If you make the blinds bigger you will create more action as fighting for blinds becomes more important. If you make them smaller the game will be tighter, slower paced as there is less in the pot to fight for at the start so it is more profitable to wait for a monster and take someones stack with it.