The title pretty much says it all.
I need to create a poll wherein I need to ask the users some questions. How can I do it using Google Docs? How will I access the data entered after that?
Create the form using New > Form menu. When you create a form in Google Docs, it automatically stores the responses in a spreadsheet. In the spreadsheet, you'll find related items in the Form menu item. Refer to the Google Help instructions for working with forms.