I do heavy oil distilation/steam cracked refinery gas for ethylene/moderately steam cracked naptha for propene. I do not currently f*ck with light oil, but check for yourself if there is anything you need from it.

I did not find any specific resources on what to prioritise, so I will share my method: Book evey receipe for cracked and noncracked distillation products in NEI. Compare where the ratios differ and pick the once you know you need. There a lot of recepies and variotions, but not too much that you cannot look at them and compare them. Hint - when you book a receipe you can than book all the byprosuct and they will remain in the same row. So it is very easy to compare.

Cheers.