June, sorry you had such a rocky beginning, but I'm sure you'll do fine with your 510.
I started off with the 901, and I love it, but as a beginner, didn't realize I should have ordered liquid or that I was supposed to blow the primer fluid out of the atomizers. My 901 came with 4 sample cartridges labeled med strength, and I ordered 2 additional pkgs (10 cartridges) of the same med. strength. I think they were supposed to be Marlboro tobacco flavor. They SUCKED big-time. I have never tasted anything so horrible in my life.
Same here with the liquid. Filling carts just sounded so time consuming so I ordered 55 cartridges instead of liquid! I'd sell them, but unfortunately they were so weak I used most of them up in three days. Didn't much matter what they tasted like either.
Same with the atomizer. Thought I was vaping poison! Made me wonder how this practice ever got off the ground.
Things are going much better since I got some liquid. I'm gonna laugh about this someday...