First-time trekking to Kalsubai from Waghbill– Any tips and things to consider?

Hello everyone, I am planning to trek to Kalsubai Peak this Sunday with my friends. This will be my first trekking experience, so I would appreciate any advice or tips from those who have done it before. Some specific questions I have: What essential gear should I carry? How challenging is the trek for a beginner? Any precautions I should take during the night trek? Any recommendations for food, hydration, or fitness preparation?