Honest opinion: Prior to teaching your son, you should be caring for him.
In the first few weeks, you should change diapers, starting from the first time in hospital. Your partner should take her time to recover from birth (even more in a C-section or similar situation) and only breastfeed and do "Kangoroo care"/Contact napping. So it is up to you to cook, clean, do administrative work etc. Interact with your child from the very first moment, talk to him, sing songs to him, move his arms and legs in play. Carry him around in a baby carrier so he can feel body warmth and sense your heartbeat similar to what he experiences now in your partners belly. Talk to him all the time, explain everything as if you wrote close caption. In later stages, try to mirror emotions ("I understand that you feel sad because..." instead of "don't cry, it's not that bad"). You are now one of the baby's two primary caregivers. Give him the love and bonding they require to build up the Basic Trust.
With respect to your original question: Mirror your sons curiosity, bring in your experience, interest and knowledge, but keep an open mind towards his interests. Don't forget: the game is determined by your child (both literally and metaphorically).
With respect to your original question: Mirror your sons curiosity, bring in your experience, interest and knowledge, but keep an open mind towards his interests. Don't forget: the game is determined by your child (both literally and metaphorically).