You are going to want to be well-equipped during your time in Starfield, with some unforgiving creatures and humans alike that are waiting to take your life. This means strapping yourself with some good weapons to ward any and every enemy off. And while you could just let yourself find the weapons you want to use lying around the game world, why not go somewhere that you can just buy some great options?
Starfield: How To Find Centaurion Arsenal
Centaurion Arsenal is a great place to add some items to your inventory in Starfield, and here's a location guide to help you find this shop.