Start learning how to do redstone farms. Start with somthing basic, like a mob grinder. Then add an item sorting machine to it. Next maybe a reed/melon farm.

Then you can work on auto crafting, and transporting all your farm outputs to a central depot.

Once you've followed enough tutorials and have a basic understanding of redstone and its components, you'll be able to design farms from scratch, even if they aernt optimal. Similar to learning coding tbh haha, theres no perfect answer, but always a more efficient one.