Whats the maximum or the minimum amount I can contribute to the account?
There are no yearly contributions limits, only overall account maximum contribution limits determined by the sponsoring state treasury. In other words, you can only contribute up to a certain amount over the life of the plan. The minimum investment amount is generally $50 per contribution according to most program descriptions, but the state treasuries determine these amounts as well. If you intend to set up automatic contributions from your bank account, $50 is also generally the minimum investment amount.