You can use Business Source Complete (including Harvard Business Review), Google Scholar, and Google searches to find scholarly and professional articles and get a better understanding of how omnichannel works and what are the best practices. Consider keywords such as omnichannel best practices, omnichannel customer engagement, omnichannel retail strategy, etc.
You can also try to find some empirical research on consumer behavior, attitudes, or perceptions on price options to provide evidence for your suggestions for specific pricing strategies. What are customers' perceptions of free shipping? Will it encourage customers to buy? Consider keywords such as free shipping customer attitudes, threshold shipping options and customer perceptions, customer return strategy and pricing, etc.
Here are some examples of the articles that can help you make recommendations and suggestions:
Google Scholar (West Chester University Setup)
Google Scholar-> Settings (clicking three lines at the upper left corner)-> Library Links-> Search West Chester University-> Check the box -> Save; At the search result page, click find it @ WCU to access full-text article.
When you find a relevant article, use Cited By function to find more recent publications that cited this article or use relevant articles to identify more articles on your topic.
Omnichannel: The path to value (Mckinsey & Company), April 2021
Omnichannel Leadership Report (NewStore), 2021
Free Shipping vs. Discounted Price: Which Fulfillment Pricing Strategy Is Better? (channel advisor, 2020)