intended to use like shisha ?   better go for e-hookah , but still cant beat a mech on sub ohm  hahaha 

forget about Nautilus BVC / Mini BVC.. it's only gonna last u for a maximum 2 weeks... after that, sure regret.. get a subtank or better... get straight a dripper..

Saru, thats exactly why I advised you to get a safe regulated mod like the IPV. And the Subtank because you can use ready made coils and when you learn more, you can build your own coils on it. You can get plenty of vapour with this set up.
I don't recommend a mech mod to a new user because if you don't know what you're doing you risk it shorting, the battery venting or worse.

Best combo that I have it.
Just got my IPV Mini 2 yesterday. The power is consistent & working very well with my Subtank Mini.

  subtank seems to be the best starter kit for newbies these days... In fact, my vaping world kicked off only after I touched subtank... first 2 month, frustrated with nautilus tank. the money spent in buying coil really wasted      . So, even by today, I still keep my subtank (for travelling purpose) even though I am on dripper most of the time

Depends on your vaping regularity. I've managed to get 2 weeks on the 1.2ohm coil at 15 watt. Then I tried the 0.5ohm at max.30 watt & it can last quite a while (2-3 weeks depending on your vaping).

The key to longevity I think is to prime the coil, let it soak for about 5-10 minutes before firing.

Saru, get the Samsung 25R, LG He2 or LG He4 batts. Get a good charger, preferably one that can charge at .5A and 1A. If you buy a cheap charger that only charges at .5A it might take 6hrs to fully charge a battery. The Efest Luc or Efest Bio is affordable and it can charge at .5A, 1A and 2A.

I didnt deswai now pokai 
about 80-100 puffs a day

Very much depends on the juice I guess. I was vaping on 50/50 VG/PG & imported juice (dunno how relevant this is) on the 0.5ohm coil firing at 28 watt 

VE is a chain store concept vape shop. I buy most of my stuffs from them & it's all ori. Honestly, Im more comfortable dealing with VE than pasar malam traders (no offense) & especially those selling in FB. VE being a chain store has a reputation to upkeep. If anyone reports in here or FB or other social media, they could be in trouble.

I think first one you mentioned isn't recommended for noob. They are more like a "if you know what you want, buy it & get the hell out" shop. That's my impression I got when I visited it. I could be wrong. VE chain of stores are generally very friendly & willing to help noob. 

Smaller hole more flavour, bigger hole more vapour but also depends on the type of juice. Higher PG more vapour (otai pls confirm  ), vape from a dripper also produces more vapour. But that's another story..hehe 

for me... the occ coil for kanger subtank not durable at all... in the first place, I vape around 5-7ml daily... and I love those creamy stuff... so, each occ coil last me at most 2 days   
pre made coil.. so far so good... can go around 2-3 weeks... 

I'm a regular customer at VE, so far service is good, not excellent (so far no vape shops have given me "excellent" service yet).

Since i'm a regular, they always give me discounts, even for popular juices.

LeGadget service is OK, but they NEVER give any discounts, no matter how much I buy from them, their imported juice variety is the only reason i go to them.

same thing here.. I started at vape brother... then, moved to Le gadget and VE... after that, always go to VE till today... so far so good... I even managed to sold some of my old stuff there before proceeding with new upgrades (racun!!!     )

The said OCC are referring to pre-made coils (plug & play). The subtank mini also comes with RBA (rebuiltable atomizer) which you can do your own coil & cotton. Changing the cotton every day or two & the coils some within a week, some two. It's much cheaper to maintain RBA, but you have to sacrifice your time to do it. Well, I done mine within 10 min for 2 tanks for re-wick (cotton). Pretty fast, so I get to do it like every night before hitting to bed.

get some mini pouch should be fine.