Tanks.
1. Aspire Nautilus or Nautilus mini for a good amount of vapour for normal juices at about 15W for MTL. Bullet proof construction. Amazing coils. Clean tasting, decent clouds.
2. Subtank Nano or another sub ohm tank to use with higher VG juices at around 25-30W for heavy lung hits to really just kill those cig cravings dead. Ever dripped on the old atties (501 / 306 etc??) - it's like that but better. Some people go higher power and even lower ohms than me, but starting point usually .5 ohms and 25-30W and see how you do from there...
Device.
Then yeah a device that can handle around 30W. I looked at them all and ended up with the Coolfire 4 because it is metal and sturdy as hell and under £40. In the vapeshop they wanted to sell me a Kanger Subox and I was like no way it's plastic lol. Saw the guy who works there vaping a CF4 and said yup that's the one I want. Same with the EVIC, was put off by the plastic. I-stick, is good I thought but prefer the metal CF4. Okay the CF4 - once the battery is gone, the device is toast, but should be a year at least for a moderate vaper. You might end up wanting super clouds (I get super clouds at .5ohm and 30W but you might want more for some weird reason, some people do) and 100W so might suit you to just buy one that can provide the power if you go down the RTA / RDA .1ohm triple coil build etc route eventually...
Anyhow something that fires up to 30W and a Nautilus full size or mini and a subtank are things you need to experience, as things have changed a LOT since you've been away. I've just started again since I last vaped in 2013 on an EGO-C set up and it's a new world.
I still swear by genuine Kanger EVODS for office use, but I am a light vaper, only smoked 5 a day, so that's good enough for me at work. But at home yeah the Naughtilius mini and subtanks are great.
Then Juice.
1. I'd recommend cheaper juices (I use Hangsen) for office use and the Nautilus if you work in an office and can't lug a mod around.
2. Then heavier VG juice for the subtanks. It's pricey for what it essentially is - VG, PG and some food flavourings and they tear through it fast - but it is a damn good vape. But 3ml will last you 2 sessions, seriously then it's gone, an hour of vaping and then need to refill. But a good vape.
3. I don't DIY but some premium juices and some cheap juices mix well if you're smart, so it drops the price per ML for the sub ohm vaping.... For example I like RY4 so mix Hangsen RY4 (2.50 per 10ml) with Space Jam eclipse (£6 per 10ml) and it's a really nice vape...
I'd recommend trying the Nautilus and the subtanks in B&M stores first. If you feel the Nautilus is enough for you you'll save a ,ot of money on juice and coils down the road. But me I've tried the sub ohm thing and well, there's no going back after that. I keep it as a treat and don't always do it daily, but yeah, it's good. Not for everyone so try it out before you buy... Good luck...