In order to know more in detail your market, the first step is to know what the features of the market are. We can define the market as a big scenario in which each actor represents a character. Sellers and buyers, products, price, offer and demand play a drama.
The following infographic summarises the market actors (elements).
Elements of the market. Source: own elaboration
Thus, we have a PRODUCT that one SELLER sells for a PRICE to one BUYER in order to meet the needs of this buyer (SUPPLY) who is willing to buy it (DEMAND).