how can i get started in merchanting

its hard for me to think of it like that cuz it only lasts 90 days

also, i hunt manos and dyles alot, and have yet to get a slingle equip or scroll

In those 90 days, you can keep a shop open for a long time. A lot of people pass through the FM every hour, that means a lot of people will see your items, meaning that you have a higher chance to sell your times. Alternatively you can spam in the FM entrance but in that time you can have a shop open and get more exposure since people can see all of the items you are selling at once.