1. Yes, when the booking includes your FB numbers, the reservation will usually show on klm.com

2. Seat selection won't be available online when you book at a TA, but you can call CZ (or the TA can do it).

3. OLCI is not available in your case (child) and mostly doesn't work on TA reservations.

When you do a dummy reservation on csair.com, you can see the fare bucket and check for milage accumulation eligability.