How does a great resume look like? What are the best tools to make one?

I want to find good clients, or work remotely for a startup, and to do that I need to make a resume(or CV?). So I wanted to ask a few questions: What should I put on my resume? Can you share some examples of how a great resume should look like? What are some of the best tools for making one? What do you look for when deciding to hire a developer? Can you share some advice that would help me increase my chances of finding a good job?