What are the keys to a happy marriage?

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I'll be celebrating my first anniversary with my husband this coming May. For the first year of our marriage, there had been a lot of ups and downs. We argue because we have different perspectives and we criticize each others attitude at times. Is that healthy in a relationship? I guess, criticizing each others attitude is still healthy because it's a way of correcting your partners' unpleasant behavior. But I sometimes wonder if I'm doing things right or am I supporting my husband enough. Do I make him happy or not? Why does he lack the will to do his project? Am I not enough as an inspiration? Or is he just lazy? Or am I stressing him out? Those are questions in my mind that is left unanswered.