I just started yesterday, and my inventory is already full. I managed to get a warehouse blueprint but I don't have enough materials to build it. And when I explore, I keep getting messages about how my inventory is too full to pick up new items, so it feels like a complete waste to continue exploring. I found out there's no easy way to just sell items, it's a real guessing game how much things are worth around here. I really want to get into this game, but I'm having a hard time because of this. Does anyone have any solutions? I've looked through item trades for the things I need, but of course I don't have the items they want, and I don't have much money either.

Use all your blueprints first.

Put stuff like soapshroom and lazulite up for sale on auction (go to Item Trades and Create Lot) for very high prices so no one'll buy them. This takes them temporarily out of your inventory.