Welcome to the forums Yo!
I've been vaping for a little bit over two weeks now. I made some mistakes in the beginning. Namely not doing what you are currently doing, I didn't research.
I ended up spending over two hundred dollars on two kits, one for myself, and one for the wife.
The kit is called a Joye 510 Mega. I bought it for $70.00 each.
Most of the kits come with two of everything, so you get two batteries, two atomizers, one charger, and a handful of empty, or full cartridges to go in it. After using this set up for a couple of days I realized that it wasn't enough of a battery life for me.
I smoked over 3 PAD on a bad day I could get up to 5. Those batteries lasted for 1-2 hours of ke chain vaping, however by the time I was through with the first battery, the second one would be fully charged. My wife can make hers last for 6 hours. She hardly ever vapes. The benefit of the Joye 510's (there are two models, the short one, and the extra long one that I bought the MEGA) is that they LOOK similar to a cigarette. Same shape around from one end to the other. So if that look is important for you, then that would be the way to go, and you being a driver, you have tons of outlets within arms reach to have one battery charging, while you are using the other.
For me though, I don't have that luxury (that's how I spent so much in the beginning, I bought LOTS of spare batteries), so after actually doing some research I found that what I NEEDED was a Joye Ego (there are also clones of this model, and that's what I purchased). The ego kit is around $70, as I said I bought a clone kit for $30 (you can go to liberty flights.com and in the top left hand corner there is a button that says 20% off, click that before shopping) they have a kit called the Riva 510, that's what I settled on, and am LOVING IT. It's $29.99 for the kit after you push that button, and as I said you get two of everything. The Riva is actually superior to the one that it is moddeled after (Joye ego) it has a slightly larger battery. For me I can get 8+ hours of use out of it before it needs a charge, but as I said, there is another battery, so that can be charging when you're using that first one.
Now about the two piece part. There is something called a "cartomizer" that you can buy as well. That piece containes the atomizer, and the cartridge in one piece. They are usually sold in 5 packs. There are lots of people who absouloutly love them, you can fill them up when you're on your DOT, and just swap them out as you're going down the road. No bottles to worry about. Personally, I don't use them. There is something new on the market as well that I just ordered. It's called themJoye Ego Tank. As the name implies, it actually has a see through tank that holds your juice, and drips it down as needed. When one tank is empty, you pull it out, and push another one on that you have pre filled before you get to driving in the morning. But as I said, mine is on order, and I haven't used it yet. But in theory it seems to me that it is far superior to the cartomizer's that I mentioned before.
Sorry to be so long winded, but as I said I made the mistake of not researching anything before, so I try to when I can let anyone new know the mistakes that I feel that I made, and the decisions that I wish I had made from the start.
Welcome to the wonderful world of vaping!