To be honest, a GOOD starter kit isn't hugely cheaper than getting something pretty decent straight off the bat.
As always, I'll recommend the Innokin iTaste MVP V2.
Here is pretty much the cheapest vendor in the UK for these :
http://myepack.co.uk/mods/itaste-mvp-v2-0-metal-grain.html
£37 and comes with a iClear 30 S atomizer. I don't particularly like them (the iClear), but many do love them. So it's worth trying. But it's also worth trying something else too, and it's always good to get a back-up. So I would recommend getting an Aspire BDC clearo too from the same place :
http://myepack.co.uk/clearomizers/aspire-vivi-nova-s-bdc-glass-version.html
At only £6 they are a bargain. Pyrex glass (as some eliquids can crack the plastic tanks you often get), and dual coil. You will need some replacement heads for both the iClear and the Aspire, but it might be worth waiting until you try them both first, to see which one you prefer.
If you think that'll be too much for you, you can get a proper starter kit. This would do it :
http://myepack.co.uk/kits/evod-glass-starter-kit.html It looks pretty decent. But I found I moved on from such devices pretty quickly, and if I knew then what I know now, I would have went straight for the MVP / Aspire combo.
That said, if you haven't even tried it, then you might not want to invest over £50 straight away. In which case, a really cheap device could be worth a punt to see if it's for you. It will work as a back-up device later anyway if you find it is for you.
I started with one like this :
http://www.paradisevapeuk.co.uk/product-p/express.htm
And for £8 it will at least give you an idea if this could work for you. It was enough for me to not smoke another cigarette, but the day I got it, and started using it, was the day I put in my order for something more advanced. So it COULD be a wasted £8, or it good be the best £8 you have ever spent.
Then it's just a case of picking your e-liquid. Depending on how much you smoke just now will determine what strength of eliquid to start with. I started with 36mg/ml, but I would think 24 mg/ml would be plenty.
Flavour is subjective. I personally hate tobacco flavoured liquids, much preferring fruits & mints. Although when I first started, Red Bull and Irn Bru were two of my favourites. But you should get a few different flavours to try them out. It took me a while to settle on my first all day vape (ADV), and my first one was Irn Bru, then switched to Blueberry and Mint. Now it's Red Astaire (from T-Juice). But finding your flavour CAN be the most expensive aspect. But also the most fun. Until you get into rebuildables anyway.