I know you can read the ohms of the clearomizer by pressing one of the buttons on the device. Say it reads 1.8. What voltage & wattage should I use if it read that? Is there a website that will tell me what settings to use? I don't want to fry the device giving it too much wattage / voltage
Start low. Vape a bit, then move up. Keep moving up until you feel like it's too much.
It doesn't matter if you are adjusting voltage, or wattage, or if you're twisting some knob and don't know how it changes it. Just work you way up until you feel like "that's the right spot". If you get a bit too high, you'll get a burned taste, and you back it off a bit.
All variable systems essentially adjust the voltage, whether they tell you that in voltage or wattage or not at all.
There isn't one right "spot". Different people have different preferences. Some flavors are better when hot, some are better cooler. Airflow matters, wicking matters, ambient temperature matters because juice gets thicker in cold weather. There are a ton of variables, so there isn't "one right setting". If there were, the mod-makers would just make it so the mod went to that "right setting" automatically.
Your car has a gas pedal not a "stop/go" switch...