Reserve character names for allied races if you can,
Level your alts to 110 and at a reasonable ilvl. Don't know about you guys but I'm an arse hole for leveling a alt and leaving it in quest gear then complaining half way through the next expac when their ilvl isn't good enough to jump into a LFD straight away!
Put x amount of gold aside each week on a level 1, even if its 1k gold and just say this gold is not to be touched, I can blow through my main stock pile.
1 toon on each faction fully exalted with everyone (Im assuming you main an alliance and have exalted but want nightborne or highmountain you're screwed)
If you're starting over with a new allied race, I don't see the harm in having one of those 1-700 profession packs and legion mats on a character waiting. We don't know yet if we'll have a prof system like legion
I like the water strider idea
I don't see the point in having a stock of flasks and potions ready tbh, maybe gliders but thats it