Canna is easy to grow in tropical climate, especially in Asia, where I am. I grow Canna from seeds. Germinate fast after filing it. You should try this which look pretty interesting and happy to see the seedling. Agree with you that Canna needs full sun and drained soil to grow well.

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As for water and sun needs this plant will do well in full or part sun, rich soil and with good drainage. You could probably manage to water it twice a week if the drainage is good but the worst thing you can do is leave water to accumulate in the bottom of the pot as a result of poor drainage. This will rot the roots and kill the plant. Hope this info helps you, I would love to see photos of your canna when it blooms!