The minimum deposit amount on N8 varies depending on the payment method you use. Usually, the minimum threshold is 10-20 US dollars. With this amount, it is possible to start playing in the lower blinds of $0.01/$0.02 or try your hand at qualifying tournaments (aka satellites) for various online series, such as the WSOP Circuit.
Please note that the min deposit sum to receive welcome bonuses may differ from the min limit of the selected payment system. Keep this in mind when topping up your N8 account.