Just rcvd a W2 &1099 for my son, abt work he did in 2017. He's currently in Basic Training, so I need to do his taxes for him. I've already completed mine. Now what?

The amount on the W2 is $1766.48 (Fed Withheld $139.42/State Withheld $21.00).  The amount on the 1099 is $1169.00. I've already claimed him on my return. Would I file both amounts separately, or combined? If separately, do I file the W2, at all? If separately, how do I figure the taxes owed on the 1099?