Hey welcome to the forum!
First things first, the Justfog Maxi doesn't look like a mod after a quick search. It looks like a standard e-cigarette on a 650 mAH battery with a bottom coil clearomizer. Since it's so similar to the Kangertech EVOD and eGo-C, a good starting point would be too never have the clearomizer below 1/3/ - 1/4 full. Anything below that you may begin to taste a burnt taste.
There is no specific
juice brand for each model, all e-cigarettes will vape the juice regardless. However, if you're looking for a good vapor than you want to have more of a VG blended mix juice. It's all dependent on what you want out of your vape and how you want to vape. The more VG the bigger the vapor. You should know though you're not going to be getting huge vapor out of that like a mechanical mod. Those are unregulated while your e-cigarette is.
Are you trying to quit smoking or ? A tad bit more info should would help some of us out to try and point you in the right direction!
Keep calm and Vape on!
