like say your getting 20 barbs, order 20 hose clamps(you need them to prevent the hose from slipping off, it doesn't happen often, but that equipment isn't cheap) unless you want to go for compression fittings( don't require hose clamps, but they do have a bling factor) they cost ~$7 each
as for coolant i would reccommend distilled water, and petras tech shop pt nuke(mix according to bottle) or distilled water, and an iandh killcoil, and if you want color, just get colored tubing