'Negate' is a very specific word in Yu-Gi-Oh. No, Interdimensional Matter Transporter does not 'negate' the attack (unlike cards such as Necro Gardna), but the attack is stopped nonetheless. As soon as the attacking monster leaves the field, that particular attack step ends, the defending monster is not flipped if face-down, and no damage is calculated.
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No, not at all. You can attack their attack position monsters first if you want.
Yes, you can build a Dungeon and place monsters in it, which you can then attack.
Yes, but you have to attack one at a time. Now if your talking about attack one monster with all your monsters the answer is no.
He has 4000 attack power. His effect is you discard two monsters you destroy all monsters on your opponent side of the field.
Yes, monsters appear in creative mode, but do not attack you unless you provoke them.