1. the exchange and return service is the most important thing for selling shoes online. Because some customers worry bought the wrong size of shoes, so they keep comparing and asking.
If you can provide 7 days no questions return and exchange. They will happy to buy with you.
2. Find some a online partner to corporate. Shoes are high competitive fashion industry in the US. With a good partner like bambooshoesbrand.com. You will find you always easy to get $5000 sales in every month. They are doing the marketing for you.
3. Open a Ebay, Amazon account to sell the shoes. That will help you creating extra two sales channel to building brand. Especially Amazon, tons of affiliate marketer will help you to promote your shoes.
4. Test the market. No one knows which style of shoes is selling good. We must test the market, and get feedback from the customers.