Minecraft kill Wither?

I have just collected all 3 Witherheads and will summon the Wither and have informed myself a bit and prepared several things for me (Diamond Sword with Spell V, Strength II Potions, and Throwing Healing Potions to do him extra harm, Gold Apples and an Enchanted Gold Apple)

Now I wanted to ask 1. What else should I take with me?

2. Where is the best place to summon him? In the Nether, far below the earth at the Bedrock or maybe in the sea with underwater species tonic + night vision?

A bow is still missing. I'd recommend the Nether, but pretty far up the Bedrock, not down. So he can hardly go further up.

Bow I forgot to mention, one with strength V, flame (is pointless against him I know), and durability III but has "only" about 100 usabilities left, but the problem is who the star he drops there in the lava If D '

In the Nether is totally stupid. Everywhere Netherrack and you can play catch with him. Just like underwater. Mine in the normal world to Bedrock and conjure him there. By the explosions you can even find interesting ores.

I think that's the right idea, thank you, I forgot that Eisengolems should pay off, I have enough iron blocks (1 1/2 stacks) so I could afford it but is it worth it?

In your equipment is the golem superfluous.

The idea is already good, but if you want to kill him with weapons would also offer a cave.

That's right, but with the Bedrock the Wither can neither move nor defend himself, but he can cave in an Ordinary.

1.I've already killed him, who did not die for 10 seconds Diamond Sword Bann V + Strength II survived 2.naja him to Ritzenungstötten is zimlich fig right?

Whether it's cowardly or not, is relatively irrelevant, since I only kill the Wither to get the Netherstern and it is unimportant in my view how the Wither dies, the main thing he is dead. Who wants to have an epic fight can the Wither too like to flatten on open terrain. That's up to you.