Q1: What is a {Trash} effect?

A {Trash} effect can be triggered/activated while its card is in the trash. Such effects can't be triggered or activated in areas other than the trash.

Q2: When my EX10-009 Creepymon attacks, in what order do that Digimon's When Attacking effect and this card's {Trash} Your Turn effect activate?

The effects trigger simultaneously, so the player can choose the activation order. However, if you use this card's {Trash} Your Turn effect to digivolve that Digimon before activating EX10-009 Creepymon's When Attacking effect, you won't be able to activate that When Attacking effect.

Q3: When exactly is the timing for the digivolution bonus draw when a digivolution would occur by this card's {Trash} Your Turn effect?

You perform the digivolution bonus draw when a card is placed on top of the Digimon to digivolve. A digivolution includes the bonus draw in accordance with the rules. After the card to digivolve is stacked and the digivolution bonus draw is performed, you process the remaining effects.

Q4: Is the "by" condition in this card's {Trash} Your Turn effect met even if I don't have a card in my deck and can't perform a digivolution bonus draw when using this effect to digivolve?

Yes, it's met.

Q5: If my Creepymon attacks and an effect such as a When Attacking effect trashes this card, can I activate this card's {Trash} Your Turn effect after it's trashed?

No, you can't. You can only activate this card's {Trash} Your Turn effect if it's already in the trash upon the timing when you make the attack declaration for your Creepymon. If this card is placed in the trash by an effect that activates after making the attack declaration for your Creepymon, this card's {Trash} Your Turn effect won't trigger and you can't activate it.

Q6: I activated this card's When Digivolving effect, and when my opponent's Digimon would leave the battle area for the 1st process, an immediate-type effect such as a "when ... would leave" effect caused this card to be removed from the battle area. Can I then process the part of the effect after "then" in this card's effect?

Yes, you can. If an effect activates, it is to be fully resolved even if the card that activated the effect is removed from that area during the processing.