Always run Flash + Heal. I've seen people going for Cleanse in some of my high quality diamond soloq games, I was instantly tilted.

Always go for Doran's Blade + Health Potion
Only time you are allowed to go Cull + Health Potion is if you lane against or and you don't feel confident enough to win lane.

First of all always try to bounce the wave. Secondly recall when you have enough money for Serrated Dirk + Health Potion.
I understand you don't always have that amount of money therefore I will help you to decide what to buy when you don't have much gold.

300G : 3x Health Potion

450G : Long Sword + 2x Health Potion

700G : 2x Long Sword

700G + : 2x Long Sword + 2x Health Potion + Vision Ward

Get Caulfield's Warhammer when you don't have enough money for B. F. Sword If you do have enough money just go B. F. Sword + Vision Ward because we play botlane 1v3.

Next item you go is Duskblade of Draktharr don't go Youmuu's Ghostblade I've tested out the dmg and Duskblade of Draktharr is better. The only time you should go Youmuu's Ghostblade is when they have alot of catch abbilties so you can move around faster. Besides this Duskblade of Draktharr looks cooler.

Next is Youmuu's Ghostblade cause arm pen + movement speed. But wait you still don't have Boots??? Yes so ? You don't really need boots in the early game as jhin because you only use Curtain Call most of the time in the early/mid game.

Ok you ain't no challenger these will help you : Boots of Swiftness

Enemy goes 12/0/0 shouldn't I go Maw of Malmortius? No. We need to carry these games remember? Get Infinity Edge

Need more range to kite these very well designed tank champions with. Get Rapid Firecannon

Lastely go for Lord Dominik's Regards when the enemy team is heavily building armor. However if they don't do so go for Bloodthirster also don't forget to buy a Elixir of Wrath. Now you should be able to 1v69.