I use a simple mantra: create, and promote. You need to create, or you won’t have goods to sell. Every trader needs goods to sell. Traders aim to buy cheap, and sell dear.
The difference between what a salable item costs the trader (to buy, and to sell) and the trader’s profit on that item is the margin. As a general rule, ten per cent is an excellent margin. Many businesses trade profitably with much smaller margins than that.
A creative business produces goods, and sells those goods. Your margin is the difference between what something costs you to produce, and what you can sell it for.
Top tip: a creative person aims to keep as many rights in his goods as he can. Ideally, all rights. So he sells copies of his goods directly to buyers, who have the right to read and view the work, but no other rights. If a creative person “sells” his goods to others to sell, he LICENSES specific rights in his goods, rather then selling his goods outright.