Boy, have things changed since 2000 - Need advice on a gaming, possible streaming PC for my tween

Last time i looked at a PC was around 2000. Am I on the right track for a PC for my 13yr old? He's mainly going to use it for Fortnite, CoD, Madden, FIFA, and the like. He says he wants to stream, so If he does, i'd like it to not look like rubbish. I would like to stay under $1200 after tax. 
https://www.microcenter.com/site/content/custom-pc-builder.aspx?load=4854b32e-79c8-48f7-b0e6-82ea4651e5fd

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