Let me save you from years of mental masturbation....
Focus on #1. Put your effort into becoming proficient at directional trading...
If you can do that,everything will fall into place.
Skew,sticky delta,sticky strike are good info,but i do not believe thats what puts bread on the table.
As a retail guy,I dont think thats where you make real money...
Get proficient at direction,and then understand which option stategy offers the best risk reward,POP, edge per your assumptions...
IMHO,Delta and/or Long vol makes the RETAIL guy rich...
The question then is how does one reliably predict direction? Efficient market theory says an edge doesn't exist. If it's possible for a retail guy to do that, then why hasn't the professional community exploited any edge that exists.

