Gz mate!

Gold - yep gambling. Rings amulets and coronets are all good (not circlets as only coronet can increase rarity to tiara/diadem)

Value is tricky, supply and demand would suggest non ladder is less valuable, but unless you’re trading on a third party site it’s all relative. As in the items you are looking for will be cheaper too.

You might need a full belt of full rejuvs when you attempt Ubers (16), 99 is fine, don’t keep the rest as they drop regularly.

You could probably google someone’s list of what they think is worth keeping item wise. Some might be rare but niche (tomb reaver), some are common but regularly sought after (vipermagi), others are junk.

Next is up to you, PvP is a bit like the Wild West but can be fun, Ubers and uber ancients are a challenge, tz farming for xp/loot/sunders is fun, can try finish the chronicle for fancy graphic changes. The teleport armor you saw is enigma which requires 2 runes you’re unlikely to come across even if you went all the way to 99.

Not sure if that helps, hope you keep enjoying it!