You should probably first order a small bottle of the 36 mg liquid to experiment with. When I started I thought I'll use a really low nic liquid but that didn't work for me well and still smoked analogs. But after I switched to a new PV and higher nic liquid I didn't touch analogs at all. The nicotine content is not only satisfying your nicotine addiction but is also responsible for the throat hit that you get when smokng.
I am noticing the same thing. I tried to start out low but found the cravings started creeping up on me. I then ordered some 24mg and noticed the throat hit more and didn't crave analogs anymore. I figure start out where you are comfortable and then you can gradually step down from there. It is good to have some plain PG on hand to cut down liquid if it is too strong. That way you are stretching your dollar. You can get some 36mg liquid and make two bottles of 18 out of it if the flavor is strong enough. Some liquid is not flavored enough to do that with but some are. I got some RY4 from myvaporstore.com and it was a strong enough flavor to cut down. I made 80ml out of a 50ml bottle that I got for $26.99 The plain PG was real cheap. I actually got it with a flavor pack at Juiceliquid so it was just sitting there waiting for that moment. I don't suggest adding that much VG because it may gum up your atty over time.