Does anybody have experience with salt water?

[BarelyBreathing]

No fish pictures, please.

I'm looking for tips of how to build a sump and get a salt water aquarium up and running. I'm also looking for tips on refugium filtration and whether or not a skimmer is needed while using this (will a skimmer starve the refugium?). This will be for invertebrates. Any other tips and advice is welcome.