Creating a poll is really easy,
All you need to do is wrap a list with
[poll][/poll] in your post. Polls can be added to any post within a topic, and you can add multiple polls to your post. See http://blog.discourse.org/2015/08/improved-polls-in-discourse/ for further information.
Here is a short example for a singular poll in a post:
[poll] - This is useful - This is pointless - I like tacos [/poll]
To add multiple polls to your post, you need to specify the name parameter:
[poll name=examplePoll] - This is useful - This is pointless - I like tacos [/poll]