There are many fittings you're going to need to install your black chain link fence. For each post that you buy you will need a post cap for your terminal (or end) posts and you will need a loop cap for your lines posts so you can run your top rail through. When your top rail terminates plan for a rail end so you can attach the top rail to the post.

Planning to install barbed wire? If so you'll need to choose which style you'd like. The arms can go straight up or more commonly they are installed at a 45 degree angle above the fence. You can also put in razor wire, it is looped and coiled and much more difficult to install.

Tension bands for the bottom of the wire come in handy if you are trying to keep a dog or another animal in your fence. String tension wire at the bottom and you can keep the fence taut and it will be tougher for animals to escape underneath.

Fittings don't cost all that much, the majority of your expense will be in your posts and your wire. If you are ordering online, get extra fittings in case something breaks or you miscount your posts.