Your best bet is to go with the small -10ml- bottles and get a low, medium, and fierce strengths each in a different flavor. Try those as they are and if you find that you like it stronger, mix some the lower strength with higher strength and vice-vera if you want it weaker.
On another note, don't go into this with the idea of quitting analogs (aka cigarettes) because just thinking about leaving such a large part of your life behind will be enough for most people to give up.
So I suggest you get a starter kit from Steve at puresmoker along with 2 extra atomizers and 2 extra batteries and the aforementioned juices and continue smoking while introducing yourself to vaping. Overtime, you will notice how disgusting cigarettes taste and the headache you get from smoking and then you will naturally smoke less and less analogs and vape more and more.
Plus, there is a learning curve to vaping, so having cigs around while working out the kinks will remove the stress from learning this new method of nicotine replacement! So if you forget to charge your batteries, or an atomizer goes out, you won't just throw it in the trash and give up; have a few cigs while it chrges up and keep with it!