Screw (or get screwed by) monster girls and do quests. Can also farm crops and craft all sorts of things. The main "story" quest currently only goes as far as finishing the Goblin Chief's story line.
Viewing post in Black Garden (Alpha 0.1.5) comments
You need a shovel and the Agriculture skill speced in Farming. You would also need to find seeds in wild plants or buy them from the merchant when available. Crafting can be done after buying the crafting stations and placing them in your house. You can also just find some stations by opening chests (rarely).