First, let me welcome you to ECF and the world of vaping.
Secondly, I would tell you to visit a local vape shop. Hopefully you have a good store close by. You can lay your hands on equipment and try out juice flavors. I know you will pay more, but sometimes when things are new you just need them in your hands. Once you have gotten further in your quest you will certainly look online for better deals.
I would say that you should get a twist style battery with the twist knob at the bottom to adjust the voltage. They go by many names, Ego-Twist, Vision Spinner, DV Spinner. I would get a Bottom Coil Clearmizer (BCC) and a top coil clearmizer. The BCC, (Kanger EVOD) you take off the battery and unscrew the base to fill. Top coil clearmizer(CE 4 or Vivi Mini Nova)you leave it on the battery and unscrew the top to fill. They will vape differantly. BCC will have a cooler vapor and Top Coil will have a warmer vapor. I would just buy one flavor of juice I would put the same juice in both the first time. That way you are comparing apples to apples. These are all entry level devices to try out. Once you get that far you will be hooked and ready to explore and seek out new and more advanced products. Don't be scared or get overwhelmed by all the information available