Personally, I use lower nic level for when I can vape freely like at home, and a stronger one when I'm at work and cant always use my e cig (or Personal Vaporizer) . I even do zero nic a lot to keep me from getting to much. Neasuea, shaking and jitteryness or trouble concentrating are signs of too much nic. Glad you got an ego, its the way to go.
As far as interesting flavors, you just have to shop around or ask. I started diy juice making after a month and a half of vaping because I couldnt find one I liked. Just shop around, or ask people what they use. My daily vape varies depending on my mood (and my stock, the diy has grown to the point of a bussiness, which I will not name here. I do not pay to be a vendor here, so I do not plug here.) But, a word of advice, you get what you pay for 99% of the time. If you pay 7 dollars for 30ml of e liquid, chances are you not going to get great eliquid. Good luck and enjoy!