How does minion damage scale?

I'm trying the necromancer thing this league, and I must admit I'm pretty new at it. At the moment I switch weapons (which are wands) without knowing exactly which what stats increases the minions damage (while hovering the mouse over the skill icon).

Someone can explain me how to properly scale zombies/specters damage?

Nothing scales your minion's stats, unless specified by "to minions" or "to allies", how ever not party members(those are players).

Easiest way to figure it out is to think of them as another players, and think does this work for them.

Support gems being linked with your minions do work, depending on the minion we are speaking of, since specters can be practically anything there isn't anything universally working outside of minion damage/speed/res/life, there are more supports that work depending what specter you have.