Sure; and exhaling at least some slowly through the nose is good too.
Too true. When vaping, the nicotine is more readily absorbed by the esophagael lining & the sinuses than it is by the lungs... remember, there's no tar to make it "stick" in your lungs anymore. Plus, hold it in long enough, and you're getting the first steps of "stealth vaping", lol.
You're probably going to get overwhelmed with info; everybody who's been there loves to help a noob, but don't let it make you nuts. Remember, these are all just opinions. For what it's worth, here's my opinions:
The 510 is what I started on, and it's a great unit; it got me off a 1.5 PAD, 26 year habit that was killing me. You will most likely (but not necessarily) eventually move on and 'up' to a higher voltage or larger battery, but don't worry about that right now. Just stick with this during the break-in time. Don't try to track how much you vape, just do it as much as you need to stay off the real ones. You'll probably vape a LOT at first (I did), but after the newness factor wears off, it'll become second nature & you'll be using a lot less liquid.
Stock up on juice... a 24ml bottle would last me about a week. As a newbie, I'd suggest getting large bottles of what you know you like, and with every order get a few small & cheap bottles of other flavors. Try a lot, even what sounds "weird"... you might be surprised at what you like. I honestly never thought I'd want to "smoke" something that tasted almost exactly like a Belgian Waffle...
Cartomizers, ohms, wattage, voltage, CE2's... these are all things you'll learn about soon. Stick with what you know works for right now, and take your time exploring the forum (and 'window shopping' the vendor's sites). Trust me, it'll all make sense eventually! I'd suggest looking up "dripping" here for your first step outside of the Manufacturer's Instructions box, if you have a manual battery to do it with.
Heheh... just wait until you discover "mods".... heheheh....
Oh, and lastly... you're what, about 2 or 3 days in? Be forewarned... in about another week, you're going to suddenly realize that you need to wash everything you own.