The most important advice? DON’T RUSH IT!
Take your time and be prepared to conduct ‘trial and error’ possibly re routing several times until you’re happy.
Routing depends on choice of handle bars and other such factors, so there’s no ‘one best way’.
You want minimal use of cable ties etc. Ideally none. If they need holding out of the way of something then lose cable ties that don’t hinder cable operation are good.
You want gradual bends. Avoid tight bends completely.
Lubrication is a matter of personal choice and cable material. Personally, I use Venhill Featherlight cables and have used WD40 on them for years, although I’m now trying WD40 dry film lubricant instead which seems good so far.