Your pen comes with an EasyFlow 9000 Schmidt medium black ink, such as https://www.amazon.com/Pack-Schmidt-easyFLOW-9000-Black/dp/B00M0VVDTE
It can be refilled with any Parker-style refill, you may choose from a wide variety of colors in either gel or ballpoint. They are available online, as well as in office-supply stores.
Please do not leave your pen anywhere that it will be exposed to extreme heat or cold, such as in a parked car. This can cause the pen finish to crack and/or the ink to dry out.
Use a fine automotive or plastic polish to clean or remove fine scratches. Apply the polish to the pen, let it dry, and then buff with a clean cloth.