The form part is trivial, but you need a back end to process the form, and that is the difficult part (in comparison). Do you have any experience programming? Does your internet provider support CGI scripts or do they provide some back-end support for forms?

A tutorial will do you no good until you have the back end support arranged, so investigate that part first, and then chances are the back end support will point you to example forms you can use to interact with it, and they will serve as your tutorial on forms.

I find the Visual Quickstart Guides to be valuable. Peachpit Press. As mentioned, there is some server-side doings. Your web hosting company may have step-by-step basic forms like this already in place, ready for you to copy/paste into your page.

Groovy, will do!