E-commerce bloggers must carefully write keeping their audience in mind. Everything you post on your blog will speak for your product or service. Your interaction with bloggers in comments and otherwise will give you a direction.
Acknowledge and appreciate your readers especially regular readers by replying to comments and visiting their work.
1 per day: If you have just started blogging, then writing consistently might take time. So set a target to have 1 post per day that is well researched.