Begin in Alena's room in Zamoksva Castle. Talk to Borya and Kiryl. Your goal is to find a way out. Explore the castle thoroughly. You'll discover a broken wall in the basement that leads outside. Before leaving, ensure you've collected all the hidden items within the castle, including a Seed of Strength. Once you've found the exit, Borya and Kiryl will join your party.
Borya is a powerful offensive mage, and Kiryl is a dedicated healer. Their spells will be invaluable. Equip Kiryl with a Staff of Antimagic if you find one, and Borya with any intelligence-boosting gear. Head out into the world. Your immediate goal is to reach the town of Taborov, located to the south. Engage in battles to level up your new party members. Aim for Level 6-7 for Alena before proceeding too far. Remember to save at the church in Taborov.