Hey, sumdumpanda. Welcome to ECF. I've read the previous posts and my buddies have given you links to tanks and cartomizers already.
Before spending a lot on a premium tank, I would recommend an IBTanked as your first cartotank for your Provari. You can get one for around $25 if that's not too much. That's actually pretty inexpensive for a pyrex tank.
IBTanked - Get Tanked With Us!



You can see the above images of IBTanks on Provari's. The first shows identical Provari's with two lengths of tanks, an XL and standard.
The standard tank will need a 35mm length carto. (Boge, Ikenvape)
The XL tank will need a 45mm length carto. (Smoktek tank replacements, Boge
XL, Ikenvape
Mega)
You can purchase carto's on the IBTanked website. The Smoktech can be purchased there with the laser drilled holes. The Boge carto's are unpunched, but they sell a carto punch tool for about $3.oo. They also sell drip tips that you will need for a tank if you don't already have some.
Whichever tank or carto you end up deciding to use, I recommend a single coil cartomizer of 2.5 - 3.0 ohm with one or two laser-drilled holes.
At least while learning the cartotank system, I recommend getting your cartomizers laser-drilled. I can provide a list of vendors if you have trouble locating these.
In fact, there is a list of these vendors in my blogs, in the link under my analog-loaded revolver avatar. I have instructions on how to set up a cartotank there also.