Check the potion crafting menu for the cheapest potion to make with the highest sell price, if you are desperate for money and can't make potions with your left over ingredients you can sell them in the storage menu, I think you just right click on them, but you should hold on to them unless its an emergence.
For the most part early game you should not keep any potions for personal use just put them up for sale because you have very limited inventory space at the beginning of the game which should be used to collect ingredients and essences, and don't forget to make the horny dust to get essences easier.