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Selecting the form to use is the hard part. There are hundreds available, all with some minor modification or feature. Some better with security, some not. Two that I like: form2mail at [web4future.com...] (free) and "simple contact form" at [karlcore.com...] ($5). I like the flexiblity on the data input more on form2mail, while I like the validation and security more on the "simple contact form."
Either of these will do the job.