DMX4Almost all fountain pens will generally come with at least 1 cartridge to use. After that you will need to choose if you would like to continue to buy cartridges or transition to bottled ink in which case you will need a converter.
Note that Parker pens use a proprietary cartridge/converter system and you will not be able to use the inexpensive standard international design.
I highly recommend the videos available at Goulet Pens and SBREBrown on YouTube for introductory purposes.
Enjoy your new pen!