Separate names with a comma.
They're numbered for a reason
I mean, you can play Fallout 2 before playing Fallout 1. You can play TES 3 before playing TES 1 & 2.
One thing is not the other.
You could have also asked in what order you should watch the star wars movies.
Well, there's the Machete Order (IV V II III VI VII VIII IX,) release order (self explanatory) or numbered order (I through IX in order.) I personally prefer release order, though I know some people can't stand not using the numbered or Machete orders.
Here's the order: IV V VI anything else is heresy.
Play the first one then play the second one.