When you create a new thread, at the bottom of the screen, there is a section called "Post a poll". Select the box in there, indicate how many options you want in the poll and when you submit the thread you will be taken to a dialog to create the actual poll.
"To estimate the time it takes to do a task, estimate the time you think it should take, multiply by two, and change the unit of measure to the next highest unit. Thus we allocate two days for a one-hour task." -- Westheimer's Rule