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Enchanting from levels 1 to 5 are "safe" - Beyond that, if the enchant 'fails' it can apparently go backwards (loses + values).
Enchanting makes your stuff glow. Different to the way Rappelz does it, different parts of your gear gain a neon glow.
Enchanting your bike makes it vrooom slightly faster!
Sit is actually useful - HP & SP (MP) regens much faster sitting than standing.
Those Cybercluster bombs they give you as quest rewards - great in PvP, it's worth having them on your skillbar for when you to Janus or Turnpike (the hourly PvP arenas)
Those little grey items that say "Doesn't appear to have any partcular use", chuck them out or sell them to a vendor - you don't need to hold onto them for anything.