After choosing the RTG world option, you can preview your world first by clicking the "Preview" button on the bottom left.
Pick a seed and let the world generate, view if the world is to your liking. Apply another seed if it's not to your liking
When you have found an acceptable seed, save the numbers on a notepad and hit Cancel. Paste the numbers onto the seed field on the vanilla world creation. You have more options underneath the RTG button, called "Customize". Here you got plenty of options. You may do as you choose here, but what I recommend is this: click the Next Page and click No for Lava lakes on the surface. Hit Next Page
Set your village size to 1 and distance to Max
Set your Temples, Ocean Monuments, Woodland Mansions and Strongholds to maximum spacing and separation. Your biomes are Large and these can get too close to eachother, if you don't set them seperate!
You're done! Hit Play and hope you enjoy!
For questions about AW2, visit their Discord https://discord.com/invite/qH287dd and please don't ignore their rules.
For help understanding what Quark does: https://quark.vazkii.net/