Help with ratios!

Hi, still new to cocktail making so thanks for any help! I ordered this a couple weeks ago and it was the greatest thing I’ve had in a while! They had it pre batched then garnished with a pickle. A couple of questions: 1) what ratios would you use for this? 2) it tasted like a very dry vermouth. Brand suggestions? 3) when oil washing the vodka, is quality of vodka going to matter? I am planning on using a nicer single origin olive oil.

Thanks in advance!!