[Hehe]

Business can be complicated and every venture is different.

A few things to consider since you are into product retail business:
Market - What and where would you consider to be your bread and butter? By this I mean a market that should at least provide you with enough income for the operation of business. If you don't have one, find one.

Cost - Many people that I know of who started their own business often overlook the expense side of thing. By expense, I'm not saying just rough numbers of this and that, but a concrete and firm number that would cost you to run the business. For example, let's say you sell 10 pairs of shoes and they cost you $100 shipped to your door, how much would it cost you to repack them separately, buy the stamps, gas/stamps to the post office and the website... etc. By knowing your true cost and market, then you can estimate what price would it make sense for you to operate. If you are able to sell at such a price, do it and otherwise, GTFO.

Supply - Where are you getting your supply from? Are they stable and/or problem-free? If not, are there better suppliers? What are the pros and cons of this supply chain?

Logistic - So you need to ship the product once sold, how is the logistic working? You get product to your place and then ship out from post office? Analyze the cost of such method to see if other methods such as leaving your stocks in an fulfillment center makes better sense... etc. As logistic is a big part of your expense, figuring ways to lower it, means more money left in the pocket for you.

Last but not least, plan ahead. And it goes for all the points I've mentioned so far. See how you'd change them as your business grows, and if any particular plan makes a lot of sense, pick every decision toward it, be it market location, size, marketing... etc.