What is the best way to send out a questionnaire that I want to e-mail to hundreds of people?

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I'm making out a questionnaire that I want to e-mail to hundreds of people.

I want to be able to send these questionnaires and have the recipients be able to answer right on the form, or (I'm thinking) pdf file. Then I want them to be able to simple send it back to me. Will pdf expert do this for me? I've been experimenting with other software and am so frustrated. I want this to be easy for people and not something that's going to take advanced computer knowledge to figure out. Thanks!