My gas stove is the type that lights itself as soon as you begin to turn the knob, it then goes from High to Low. Can I turn it on on Yom Tov or would I have to turn on from before Yom Tov?
You can skip the “ignite” by going straight to high/low and lighting with a match.
Alternatively (and preferably), you can pull out the plug and light with match. You would need to have a pre-existing flame, such as a yartzeit candle.