Welcome - you are doing well - just take one day at a time and learn to get the most enjoyment out of the kit which you have ( which is actually pretty good - some folk don't feel the need to go beyond your combo ) - and BTW should you ever decide to sub ohm with your 40w istick you can - the GS Air tank was designed to run with an iStick which takes 0.75 ohm coils; I use just that as my outdoor set up daily.
I'm kinda thinking about a sub ohm. I just don't know where to start on any of this but I'm trying to learn! I'm just excited that even though I'm still smoking I'm around a half a pack a day! I haven't been under a pack a day since probably around the time I was 18 or so.