Sounds like you're getting it!
Re Boge - I think there are a couple of makers of 510 cartos (cartomizers) and Boge is one and I think E2 is one.
To get a good drag without too much effort.. if you have an automatic battery and the atty is cool, you can try a short puff first to warm it a bit then your real puff. With shift the button press and release about 1/2-1 second earlier in time than your puff like: press..start puff...release..end puff.
The ejuice vapor will feel real weird to your throat at first. Drink plenty of water. In general PG juices have more throat hit (TH ie. feel more like smoking) and VG has more visible vapor (the fake "smoke"). But you'll find even with the same PG or VG or PG/VG ratio, some flavors will have more flavor than others, some will have more TH than others. I find some ejuices leave me wanting or feeling like I just ate and now want a smoke (that's bad), and some satisfy me. To start with, find something that will at least satisfy your craving (I was a non-menthol smoker and for me, plain old PG Marlboro-like worked though I didn't like the lack of vapor or the flavor). Then experiment with juices. Find one or more you like that satisfy you.
If your vapor/flavor starts to thin or tastes a bit funny, see if the cart need topping off (to dampness, not to a puddle). If if still tastes wrong, check if the atty needs to be blown out (into a tissue) and if the atty's OK then for me it usually means my battery is getting weak and about to run out of charge. Then yes it does run out of charge and I swap batteries. I use a PCC (charging case) when at work or out. I have a smaller PV but I think those steps should apply to most atty + cart combos.