Need tips on Gnar

When i play him tank gnar i get stomped by any gap close top lane hoping that i become effective in team fights but then i am only effective landing CC with 0 damage. So should i just play him ad top with ignite or smth and for team fights Q till mega ? cuz i cant trade with AA in team fight or i will lose HP i need to engage . Also about runes , AS or Armorpen ? For build , casual BC FM ? or TF Yomumu or botrk for damage ? I was thining about Armor pen - armor - scaling cdr runes for mega But then my minignar early trade offs will be weaker and it's really important specially when i am not getting ganks .
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