Kog's base AD stat is below average but he has one of the best AS base stat (I think only Vayne is better). In lane you want to just last hit so AD is more important than AS. ( I know with higher AS it makes your animation a bit more smoother but AD will still help you a lot more than AS).
If you use AD marks and AD qunits but start with a long sword you will get 25 bonus AD (instead of dorans blade and AS quints). This will help you with last hitting minions.
With this set up you won't be able to trade or go all in with the enemy lanner. If the enemy lanner is too aggressive, you can turn on your W which gives you more attack range allowing you to stay out of the enemy's attack range. Your W has pretty low mana cost and cost cool down that you can use it often. This should allow you to last hit even under tower.
Your first item should have AD on it like phage or vamp scepter which will help you with last hitting more. After you completed your first item (trinity or botrk) you should rush attack speed items like boots, or hurricane, or wits end, or rage blade. Since your base AS and scaling are so good, even without AS runes, your attack speed will be on par with the enemy adc.
TLDR: In lane play passive with your W. Use AD marks and AD quints. Start with Long Sword.
