A Provari is the best easily available high end vaping device. Until you have owned and used one, you couldn't understand. If I knew what I know now back when I started, I would have saved enough money for several Provari's by this time had I gotten my first on day one. If you are truly dedicated to wanting to quit cigarettes, the extra money spent on a high end device like the Provari makes sense to me.
Besides the basic Provari, or mini-Provari, you will need at least 2, preferably 3 batteries and a battery recharger. Provape strongly recommends AW brand IMR, or high drain, batteries. Never sacrifice battery quality by buying cheaper brands. I got the Pila charger when I bought my first big battery mods, and I'm still happy that I decided to invest a little more in the best easily available charger on the market. The algorhyms it uses to charge batteries may prolong their overall life, and charges them faster than other chargers.
Whether to get the extension cap in order to use a bigger battery to get longer battery time is entirely up to you. If getting another 2-3 hours battery time is important to you, get it and the appropriate step-up batteries. I myself, got the Provari 2 with the extension cap, and got both types of batteries; w/o the cap for when I want to vape a shorter mod, with the cap for longer vape time.
I would get a mix of vaping devices to try out since you are new. A couple each of atomizers, clearomizers, cartomizers, and ce3's. A vivi nova tank is easy to fill and clean, and has replacable heads when the first one wears out. You may want to pick up a couple of drip tips to use with the atomizers and cartomizers. Most people seem to like the Cherry Vape Ming drip tips.
Juice is the tough one to recommend as it is so subjective. I can only tell you what I did at first; I smoked Marlboro Menthols, so my first juice was Ice Menthol (not a minty menthol). It served as my all day vape until I found other flavors that I liked. If you smoked a non-menthol, perhaps the tobacco juice users can recommend a good first juice flavor.
Read the two juice forums here at ECF to get ideas of what flavors and vendors to order from. Aside from your first juice, I'd only order sample packs or small trial sizes from juice vendors until you find what you like enough to buy again in a larger bottle. I never learned to drip, it just didn't work out for me. If the same happens to you, the I found the best way to sample juice flavors is to use the smaller ce3's. They only require a small amount of juice to sample a new flavor, and if you don't like it, you can remove it, rinse the ce3 with water, and fill again with the next flavor. They do require a small needle and syringe to fill, empty, and rinse, which usually is included in the 5-pack.
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You have found an excellent resource right here to guide you and support you. Don't be hard on yourself if you allow yourself a few cigs the first few days of vaping, eventually they will start tasting nasty and you won't want another one. Finding a juice that you don't mind using all day is a major key to success.