You will need a platform to code in Python. There are many options. If you are new to all of this and have internet connection, then I highly encourage you to start with Trinket
However, if you are looking for something more, then you can explore all these code editor platforms and choose your preference
If you are new to the Raspberry Pi and just want to get more comfortable with how it works, setup, and features, then I suggest working through this Code Club Course: Getting Started With Raspberry Pi
If you use the kit we use or own the book, Adventures in Raspberry Pi by Carrie Anne Philbin, then I suggest going through at least the first Adventure to get familiar with the Pi.