That's right, "different" is an adjective and "difference" is a noun.
When you're describing something/someone you need an adjective, therefore you need to use "different". Here are some examples,
Example 1: "The joke my brother told me was really DIFFERENT from the one I heard on TV." -- We are describing the joke.
Example 2: "DIFFERENT magazines have DIFFERENT articles." -- We are describing the magazines and the articles.
"Difference" is a noun, it shows how things/people can be different.
"The DIFFERENCE between my two sisters is huge." -- Two sisters are very different.
"In yesterday's class Mary learned the DIFFERENCE between two grammar rules.". -- Mary learned how different are the two grammar rules.
I hope this helps!