If you don't own the champion already (Maokai), and you would receive the victorious skin from being Gold, do you also get the champion? If you don't already have the champion, does that mean you don't get the skin?
Yes
Yes
Yes, players who are Gold+ in Ranked will receive both the Champion and the Victorious Skin.
Here's an official source from Riot for last years 2015 season rewards. (read FAQ)
http://na.leagueoflegends.com/en/page/2015-ranked-season-draws-close
Yes, when receiving a skin of any kind from Riot, if you don't own the champion you will get the champion as well.
