What do I build on Ahri and what do I max?

Being an ADC main, I decided to use this season as a way to expand my pools. I fiddled around with different lanes and champs and saw that i can't top lane all that great, i can jungle decent but my teams always get mad when I am not ganking when they are pushing their opponents under tower all game, and I find supp a little boring cause I like to do damage, so i turned to mid lane. I have tried Yas and Zed, i just can't pull them off. Then I found a love for the Mages that can function as an assassin ( Such as Syndra and Ahri ). But with Ahri I can't figure out what exactly to build and it really crushes my play. Some guides say to rush mana regen others say rush Luden's and I know to max Q but after that I am blank. I am not that great with her yet but I plan on practicing a lot with her. Thanks if you can help (3