1. A natural love for detailing vehicles. Even though it will most likely feel more like work than love... I believe you better had started from love or else why would you make a commitment to be a detailer? For the money? Pfft...
2. An open mind to be willing to try new products that may be new to you./The ability to breakaway from any fanboyism in exchange for better results.
3. The common sense to know which tools/products are truly worth investing in, and making sure they're part of your arsenal... And also the common sense to weed out which product/tools are flat out a bunch of hype and can be had for much less with superior results. [they actually exist]
4. Hard work, determination, honesty.
It's not about bragging about having detailed a Ferrari, or posting some youtube videos with cool intro music, nor is it amassing a long list of fake positive reviews on some "trendy" website... At the end of the day it's loyal repeat customers that are your bread and butter.
5. The gift of gab.