Buying a provari right off the bat wouldn't be a bad idea per se, but you may not exactly understand all of its 'features' unless you were closely guided through the process with the help of a vet.
Most PV (personal vaporizers, another term for 'ecig') that people here on the forum use consist of two elements.
1. The 'device'. This is usually just a big battery, colored to your choice to look pretty. To charge it, you would simply screw it into it's charger. Just like screws, the 'threading' of these devices come in different sizes. Most common threading I've seen so far is '510'. You'll learn more about that later.
Sometimes the 'device' is a 'tube' with batteries in it that you can take out, charge separately, change out, etc, as opposed to just being a big battery. This is like the provari. These are usually more durable, most customizable, and receive more praise for being 'high end' stuff.
2. Your "tank" system. This is literally just a tank that you screw onto your "device" that holds your
eliquid, the juice that is good and flavorful and full of nicotine. The battery heats coils inside of the tank, vaporizing the juice and giving you your inhale. There are many different types of tanks. For a better understanding of tanks, I would use google or open up a 2nd thread and hope that Baditude fills you in. Some simple and widely acknowledged tanks off the top of my head would be the Vision Vivi Nova (just fill and vape), the Kanger line (same concept but a bit different with the "coil" position), and the "cartotanks", which are tanks with a "cartomizer" inside of them. Again, you can learn more about that with some research.
As for getting yourself started, I would recommend the same setup I used, and still use, to get my fix. The 'device' would be the Vision VV Spinner 1300mah, which is a fancy title for "big battery". The "threading" I mentioned earlier on this battery is 510, meaning most tanks will work with this and its easy to customize and do what you want with it. This battery lasts me pretty much all day.
For the tank, I'd recommend Vivi Novas. They are easy to use, refill, clean when necessary, and customize once you get a bit more advanced. You can look up these product names on google and find them from a million vendors. First try using the Trusted vendors that this website has on hand.
And if you become curious or want to explore, the earlier comment made by somebody who said you should check out Tasteyourjuice.com was right. His
reviews are detailed, easy to watch, and high quality.