welcome!
like the experts said:
first: check the recommended wattage range on the coil or the package
2. prime the coil manually like in the first vid (get the cotton saturated with a couple of drops, maybe even in the middle)
3. put it inside the tank and add the juice and let it sit 10 min say
4. turn on the coil and
5. choose VW (variable wattage) / Power mode (whatever label your mod uses for this)
6. set the wattage a a couple of watts under the recommended wattage
a tip that helped me at the begining and still helps when 'breaking in' a new coil is to start inhaling/dragging just before you fire, it'll sometimes need a stronger drag at the beginning, not too hard though. you'll get a feel for it after a few changes.
ditto the recommendation of 70vg/30pg juice, higher pg can leak in these types of tanks (some more than others)
you'll learn abt the other modes later, and you might never want to use them. there's loads of youtube videos and guides out there and here. it can be fun cruising them
good luck