First off, you really need to do your research on on electronic cigarettes & e-liquid. There's a lot of rubbish products and vendors (as vapers) call them.
Where can I get an ecig e-liquid from?
I use 2-3 vendors, and I am quite picky that they are Ecita members. Generally for my hardware, I want to know that it's safe, has been tested, and has been manufactured to a good standard. As I say to my friends- you can buy cheap electronic cigarettes for a few quid but its a bit like buying a car for £100 you won't get very far!! The first kit I had was from a local vape shop but I soon advanced onto some more sophisticated mods. Don't get me wrong, ciggalikes' are great for a newbie, but once you get into vaping, you'll most likely find you need something a bit more heavy duty, particularly with a better, larger battery. The 180mah batteries that come with your average ciggalike only last a couple of hours at most.
As for my juices, I buy my e-liquid from www.Ecigwizard.com. They have 5 different ranges of e-liquid, all at pretty decent prices. You can try and get some of them from the US, but frankly when you add shipping costs, its a bit of a ball ache. They also offer good customer support I've emailed them 3 or 4 times and had a response within a few hours.
For mods, you may need to look to the US for a wide range. However, my personal preference is not to carry round a 6 foot battery case, because it gives me a better battery life'. There's a real diverse community of vapers' round there such as UK Vapers in the UK to check out.
Try different flavours, and make sure you buy in small bottles. Don't splash out on a 30ml bottle, and certainly don't buy in 50ml+ as some people do, then whinge that they don't like it. It's a bit like buying enough coffee to last you and your family, a year, then when you try the first cup, you moan about the flavour!
Test and try and be open. You may have to go through half a dozen ‘bad' flavours to find the one you like. Taste is very subjective, so one man's treasure is another man's poison.
As far as helping me quit smoking though, my electronic cigarette and a good range of e-liquids (I've got three personal favourites) keep me away from the cravings.
Update: 07/03/2017 - I have to say as of right now, the Nautilus 2 ecig tank by Aspire is ticking all my boxes.