Your starting inventory space is very limited with a twenty item capacity. In order to save space, leave discovered items on the ground until needed. For example, if a strawberry was hidden under a bush, leave it there. It will remain intact for over a day, even if the bush grows back. This also is true for fruit, worms, vegetables, etc. Crafted items such as planks, milk, and eggs, will remain at their location indefinitely. After constructing the Swap Shop, use it as storage for clothing and furniture items. You can place your items for sale, but at an unreasonably high price. Simply take an item off the market when you need it. The architect's plans for the warehouse becomes available after you start Emilia's quests. Build it as soon as possible to gain 35 slots of storage space. Building the warehouse requires 1,800 gold for the blueprint, 4 Stonefish, 4 planks (12 driftwood), 1 sawdust (3 driftwood), and 1 purple paint (2 grapes and 1 blue apple). The recipe for sawdust costs 100 gold, and the recipe for purple paint costs 200 gold. Upgrading your inventory requires 50 pearls, the game's premium currency. You will start with only 30 pearls and it will take some time to collect 20 more pearls outside of an in-app purchase.