If by "ancient" you are referring to Armour that is linked to the Ancient Magiks or Ancient Curses then I'm afraid no such armor exists. There is however the "Ancient Staff" A weapon you can purchase at any time on the grand exchange but cannot use until you have completed the quest "Desert Treasure".
If you are looking for armor with Magic defense/attack stats then there are various types you can use; if you were looking for fairly affordable armor that was relatively good then I would suggest any type of Mystic. I would advice searching the Runescape knowledge base for more information: http://www.runescape.com/c=f7UKfbSOKyI/kbase/guid/manual
The only other armor in the game that could be classed as Ancient is "Third Age" because in the game's storyline it dates back a VERY long time.
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gold armor is called gilded armor in runescape and is gained through treasure trails
You can't trim armor on RuneScape if someone tells you they can trim your armor don't give them your armor they are scammers
The next level would be rune armor.
No, but you can purchase trimmed armor from members.
The "Satan Oracle" armor is from a youtube video. It is not part of the real runescape. The user used photoshop or something to edit fake armor onto his character.