In Den Helder you will take the ferry to Texel. The ferryride will take about 20 minutes, for which no prereservation is needed.
Once you get off the ferry, you need to ride into the direction of Den Burg. At the second roundabout you will take the first exit to the right (exit 10) into the direction of De Cocksdorp.
From there follow the sign indicating "vliegveld". You will see the airport on your right hand side.
With public transport:
You can park your car in Den Helder, take the ferry as a pedastrian and use the public transportation on Texel.
You can use a Texelhopper to get a ride from the ferry terminal to the Paracentrum Texel. It needs to be booked at least an hour before depature via phone under 0222-784 000 or online via texelhopper.nl.
The Texelhopper will be waiting for you to step in right in front of the pedestrian exit of the ferry.
Pay attention: the bigger busses such as Connexxion (lijn 28 and 828), will not pass Paracentrum Texel, but only ride to Den Burg and De Koog. To get to the airport on Texel you must take a Texelhopper.