I was 'you' last year. I smoked maybe 15 rollies a day, depending on stress.
You'll get a lot of advice, which will be confusing, so I'll try to help de-confuse it! I wish I'd been told the following;
1. Just buy the zelos kit. And a bunch of spare coils (1.8 ohm), as they only last a week or two (you may get longer, but always have spare coils). Vape within the wattage printed on the coils.
2. don't be put off by a bad flavour. find at least one you like, it may take a few.
3. don't assume you *need* high nicotine. even 6mg was harsh for me, and I immediately dropped to 3mg. Same story for a VERY heavy smoker I work with. He didn't like vaping because it was so harsh. We both quit fags EASILY (at different times) on 3mg.
4. don't obsess about the cost just yet. It costs a few quid to get setup, and you may have to try a different setup before you find what you like. It's the end of cigarettes, it's worth it, and there are LOADS of money-saving tricks you can learn. But for the next few months, ignore the cost, as it WILL be cheaper in the long run.
5. Most vape shop employees know fuck all. You'll get the best advise here. I was sold a deeply unsuitable setup by a local shop. There ARE good shops around, but until you know whether or not they're talking crap, you may get screwed over/get bad advise/get put off vaping.
Good luck!