Ask HN: What are Best Practices for Freelance Contracts?

I do some freelance work on the side and recently a client asked me to provide a contract that covered deliverables, length of service, e.t.c. I want to make sure I don't over commit and support his website for 10 years, but I am not sure what is reasonable. Most of my clients are not technically savy, and the sites I am building are not high traffic so I am just curious what is fair. Are there resources for figuring this out? Or standards you use?

Thanks HN!