Maybe you could tell us what bike you ride and we could give you some input as to how to set it up for enduros.
As far as personal set up, ie: riding gear, you'll definitely need a CamelPack, Plastic roost/Chest protector, knee/shin & forearm/elbow guards,( you'll know why when you clip a 4" pine sapling with your forearm pinned in third and it knocks you to the other side of the trail where your knee hits another tree), well vented pants/jersey for summer, and an Enduro jacket for the winter. A fanny pack to carry an extra pair of gloves and goggles, is nice to have at wet races, or a towel to mop up sweat on hot days. A separate fanny pack loaded with a spare plug in a water tight container, plug wrench, spare masterlink, combo screwdriver, tube patch kit, and co2 type pump, mini ratchet w some common sockets, or a small cresent wrench, mini tire irons, and small first aid kit. these things can also be stored in some CamelPack systems as they have models that offer storage compartments. or you can lighten the load by running Mousse Bib inserts or Tire Balls and leave the flat fixing stuff in the tool box.