Maybe consider subscription-based services? Regular customers weekly. Also get some nice branding going, people love a good story with their bread. Maybe share some of your journey on a blog paired with your website?

The flour taste makes me think the ratio of flour to fat/sugar might be off, or it's possible you didn't cream the butter and sugar enough before adding other ingredients. Creaming adds air to the batter, helping the cake rise better. One more thing, make sure to check your oven …