Summarize the following:
Starter kits are great because they offer all the parts you need for tattooing. These kits aren't high in quality, but they are great for beginning to operate and maintain a tattoo machine. Consider the quality of your machine before tattooing anyone. A set up that is cheaper could hurt or infect someone or result in a low-quality tattoo. You'll need an Allen key set and a small screwdriver, at the minimum. Check out the kit instructions or look over the individual parts to determine if you'll need any other tools to set up the machine. If you have a regular tattoo artist, open up a dialogue about home kits. Artists who operate out of tattoo shops often have worked from home at some point. They can offer valuable input. Some professionals may even be willing to give you a tutorial on setting up the machine, for a fee.

Summary:
Buy a starter kit for a convenient option. Get the tools you need to set up the machine. Ask a professional for advice if you're new to tattooing.