That has nothing to do with ‘industry standard’, this has to do with doing it in a way to reduce mistakes and get as much help from the computer as possible while doing 10 things at once - the A in CAD stands for Aided.
If you do the schematic first and proper, KiCAD will be able to get you:
- a copy&paste list of devices you can use to order at DigiKey/Farnell/whathaveyou
- a check for correct wiring of your devices (power inputs/outputs correct?, any wires left open? ..)
- a check of your layout (all tracks layed down so they resemble the logic of your schematic? distances between tracks correct? ..)
- a set of gerber files that will have the devices identifier on them and even on the fabricated board for troubleshooting/assembly/getting it to work the first time
- and way more..
Do yourself a favor and read the 101 tutorial on the KiCAD website.
And then sit down on Chris’s videos.. he’s got a beginner series that runs you through 3-4 videos from schematic creation to gerber file output.
You need that. It will cost you 4-5 hours of your time now, but will safe you 5-10 days troubleshooting what you do wrong within the next month.
Tutorial: http://docs.kicad.org/en/getting_started_in_kicad.html
Videos: https://www.youtube.com/playlist?list=PLy2022BX6Esr6yxwDzhqYZyuuenJE2s5B
PS: The knowledgeable & helpful people here will tolerate wild-bill-style for the first 2-3 questions/approaches to do things with KiCAD, my limit is reached already as I had to post the same question 2 times. Good luck.