How To build Evelynn

so i have had to amazingly weird games on Evelynn even thou i didn't knew what to actually build on her ...... here are the games

Game One: http://matchhistory.euw.leagueoflegends.com/en/#match-details/EUW1/2244483282/48674012?tab=overview

Game Two: http://matchhistory.euw.leagueoflegends.com/en/#match-details/EUW1/2245650249/48674012?tab=overview

any feed back would be helpful trying to get better at evelynn