There is no way to find it, you just have to hope you run into it.
First you need to unlock hard mode. there after is there a mob, that is in the underground corruption, that is very similar to the man eaters from the jungle... They don't always drop it, but when they do it's about 6 cursed flames... You can also read about Terraria in the Terraria wiki. There can you also read about the drops, weapons, npcs and much more.
At least phaseblades and the jungle armor breastplate, but for more info go to terraria wikia
The Mimic can be found in the Underground Corruption which only appears after you have defeated the Wall of Flesh. (They have a Wiki for Terraria so you don't have to wait 2 weeks for someone to answer your question.)
In Terraria, you can obtain vines by cutting down jungle plants, specifically jungle grass and thorny bushes, found in the Jungle biome. Vines will drop when you break these plants. Additionally, vines can also be found hanging from trees in the Jungle biome. If you need them for crafting, make sure to explore the Jungle to gather enough.
They can be used to make part of the jungle armor, the blade of grass, and the thorn chackram
You can find it on Steam.
Once you have killed one of the 3 Mechanical Bosses, in chat you will see "The jungle is growing back". If this happens, you may need to wait up to 8 Terraria days
Heart Crystals are found Underground and in the Caverns. You can see their faint glow in the darkness.
Chlorophyte spawns into the world when you enter Hardmode, in the 'Underground Jungle' area. However you cannot mine it yet, until you have defeated the three mechanical bosses (The Destroyer, The Twins and Skeletron Prime) as you need the items they drop to create the first tier of pickaxe capable of mining it.
Click on Inbox.
It is never same: it is either left or right. The only thing is that it is never on the same side of your world as the jungle.
in the jungle you will see stairs go down them