Hi! Just opened my package and am attempting my first vaping experience. The order came with empty cartomizers and e juice. Do I just squeeze drops into the tiny hole in the cartomizer? And into the hole on the side that screws into the battery, not the one on the mouth side, right? I tried this without assistance and ended up with kind of sweet tasting and numb lips (not using flavored e juice), which seems maybe not right lol! Also, after a couple of drags, the cartomizer part got really hot. Is that normal? Sorry again for lack of lingo and general incoherence! I'm a little overwhelmed by all this! TIA