No worries,the whole thing about vaping is a coil that heats up, so since you're using a regulated mod, the chances of something truly bad happening is near impossible unless it was seriously defective.
Now that you've seen that the coil is heating up correctly, wick it, and prime it.. trigger and watch how that goes... the liquid should be bouncing off that coil (boiling) evenly, (and hence creating the vapor). Play with your wattage at this point, thi should provide you with the answer.. if, while you're priming it directly, it's all good, no burning, (smell or visual), that it's not going too fast to boil the liquid, then you can establish the next step, which is the wicking itself.
Cotton Bacon is a fine wick, which I use myself with no issues, you just need to pull the right amount, normally it should be about the thickness of the coil (at least that what I go for), making sure it's aligned (the grain), then roll between your hands gently, then twisted to squeeze it just enough for it to temporarily be small enough to be passed inside the coil, then untwisted and moved back and forth a bit to "fill" the coil (and getting it between the wraps). The tips of the cotton should be cut very neatly (sharp edges for the fibers) and only long enough to be placed and have these tips dipping in the liquid (via the feed).
Because it's a straight through wick type rba, one thing that can work with the wicking is that once it's in, the tips cut and just right... get a needle (or wire) and pass it right through it in the middle to create a little hole/tunnel. As long as you do it right and don't cause leaking, this can improve wicking like crazy.
Because you are using a iSub RBA, note that this appears to be a fairly small coil (had to look it up as I'm not familiar with all devices out there, but have similar), so it's not going to be the best for a warm vape nor clouds. You might want to go for a vertical build with such a RBA, possibly consider temperature control.
The smaller the coil the faster it tends to heat up... I haven't worked with Khantal for a while, mostly NI and SS, but as SS is fairly similar in behavior, I know that the smaller the coil, the harder it is to balance it just right as it ramps up fairly fast. That's why that taking the time and watching it bubble and spit before closing your tank up is a good learning experience.
You could also try getting some 28 gauge and see if that might work easier for you. You'd be amazed what trying a different gauge or metal can do and finding the "one" that you really like and works great for you, can take a few tries.
I really appreciate that think about the needle to creat a small hole. As I'm a beginner, I thought that the iSub RBA could be good like my first RBA device. It looks so simple and easy, but now I'm not so sure lol. I don't know anybody who use vape devices. I'm starting with it because I quite to smoke, so I'm going onto this just by myself and with the advices that I'm reading... This forum had really help me today and I've learned a lot with all of your advices, thank you so much
Glad you got it working for you, 
