If you choose to travel to Texel by train, pick the Intercity train with destination ‘Den Helder’. Coming from Schiphol Amsterdam Airport first choose Amsterdam Central Station or Amsterdam-Sloterdijk Station and switch trains to ‘Den Helder’ there.
The Intercity train connecting best to the TESO ferry leaves Amsterdam Central Station (CS) every hour at XX:41 hours. It arrives in Den Helder at (XX+1):56 hours.
After you arrive in Den Helder, choose line 33 next to the railway station. You can check out the timetable here.