Welcome. The first piece of advice I'd give you is to read the different threads on this forum, especially the pinned threads. All the information you asked for is in there.
If you're just starting out I wouldn't recommend a mod for you. Start simple, learn how things work, what works for you, what doesn't, take baby steps. We've had a couple of new vapers lately who bought mods to start and regretted the purchase. I would recommend going with something like an eGo Twist or Vision Spinner, they're both variable voltage batteries. Pick up a Kangor Pro Tank 2 or Pro Tank mini or an Anyvape Davide or Davide mini to start. These all use the same Pro Tank coils. Figure out what ohm coil works best with what voltage, what ratio of PG/VG works best for you as well as the optimum nicotine level. There's a lot to learn on the basics, the terms, the equipment, etc.
I would recommend you start out with a Joye Twist or a Vision Spinner so you can get the hang of variable voltage. Top it of with a Kangar Evod and you'll be good to go.
