There is No etiquette in open...Good Manners are something else.
1 . Expect to be interdicted whilst playing in open
2. If you get interdicted DO NOT shoot first unless you’re in a anarchy system.
3. To evade an interdictor, before you actually move away from the star towards a station, go to the nav panel and highlight a neighboring system, don’t select it though unless you’re interdicted.
4 . Always submit, that way your Fsd cools down quicker. Then go to nav panel and High Wake out. NEVER low wake , your assailants will simply chase you down.
5. NEVER combat log, there is no need if you follow the Advice above.
6. Last but not Least. Open Play is far less scary than some people feel, you can go days and travel 100s of light years and never see another player. Other Times depending on where and when you’re online , it can be like the grand central. You soon learn what to watch out for and where to avoid.
Blaze your own trail, do what you want to do, and go where you want to go..That’s the freedom we enjoy.
Fly safe