Installing an audio system for the first time in 20 years, need some help...

[MTG#10]

Im installing a cheap system in my new (2011 but new to me) F150 because the factory system is garbage. Ive already installed four new door speakers (Infinity 682.11cf) and Im doing the head unit, amp, and sub this weekend.

My head unit is this Jensen, I went with this cheap Boss amp, and this 12" Kicker.

I used to install systems in my own vehicles and my friends' a lot when I was younger so I know what Im doing for the most part but this head unit has something Ive never seen before, a dedicated single sub out plug, a pair of front RCA plugs, and a pair of back RCA plugs.

So how would I go about connecting the head unit to the amp? The amp has normal left and right RCA inputs. Since Im only running one sub, and no amp to my door speakers I'd assume the sub out plug on my head unit is what I'd use but its just one single plug...do they make a converter or would I just plug it into either the right or the left?

Any help/advice appreciated!