Fiora help

Hey Guys,

I decided to get Fiora and try her out before her rework. I really like her, and man her late game is amazing, but I need tips on how to poke, cs, the best build for her, her spell combo, and who she is good against and bad up in top lane. I just played her my first time ever, and got paired with...yes you guessed it, this monster, . Holy crap, man I gave first blood and three more kills after that to him, and he kept laughing and going for me when I just tried to cs under tower. I made him pay for my first kill, he flashed after me under turret and tried to ult, I still had health left from the turret shield, and as the turret was focusing him I ulted and got him. Then on in the team fights I just wrecked, getting a triple kill and so forth, finishing 17-12 I think it was. Still, I think I did her combos wrong and probably didn't build right. Any tricks and help you can give will be greatly appreciated. Thank you.