Well, first of all you have to write a really good hub on a topic that hasn't been done a million times already!
You should always use multiple text and picture capsules and title the capsules with the proper keywords. Videos and additional link capsules that are all relevant and all titled properly with keywords as well - can only help.
My advice is to stay between 700 and 3000 words. Much less and much more won't help you, and may hurt you.
Some people do well without hardly ever adding pictures or videos or other links - you have to be a really engaging writer to pull that one though.
Some simple backlinking will definitely help - but don't go off and join some service that promotes you....that's a very good way to get Google Slapped, or Sandboxed - or all other manner of nasty sounding internet voo doo spells aimed your way.