Manor

how does the manor works?

i know how to buy seeds, sow and harvest.

the tricky part is how do i get anything from the seeds? and how many do i need to get a reward?

is there a way to calculate this?

there are two things here, ill call them reward and return. lets say your return rate is the amout of fruit you get per seed from a certain mob, and the reward rate is how many mats you get per fruit when you trade them to the manor manager. ideally you want to seed mobs that give you greater than a 2.5 return rate, and the reward rate is based on the price the fruit is being bought for by the castle owner, as well as the NPC value of the material. the NPC value of a material is 2x the price the NPC shops will give you for it if you attempt to sell it to them. the formula is:
(number of fruits) * (price set by castle lord) / (NPC value of mat)