Used a mod or put grass in your house dirt doesn't work so you need to find grass surrounding that dirt you placed and then you need to wait till the dirt goes to grass. Animals only spawn near grass.
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Get single player commands then type in spawn silver fish. Make sure it's not on peaceful.
If you lost it once, you will hardly found it again. If you remember where you were going from spawn area, then just follow those steps, because in one world, you will always spawn on one place, as many people didnt notice. So if you dont remember steps, make another house and make giant block tower near the new house, or make signs from spawn place to house, so next time you die, you will easily get back to your house.
You need a mod for that, I dont know of one.
There's no way to make them, it's just something you can use on Creative mode.
You cannot make cocoa beans. They spawn naturally in jungle biomes on jungle trees. You can also spawn them via creative mode. Hope this helps.