Gospel Parenting - Questions from an almost Four year old

I read the creation account in The Jesus Storybook Bible (Sally Lloyd-Jones) last night with Elijah. The boy had his thinking cap on again.

Me: "Before God made anything, there wasn't anything except God, and He had a plan to send Jesus."
Elijah: “Dad, who made God?”
Me: “Nobody bubba, God has always existed.”

Later on after the creation of the animals, leading up to Adam and Eve:
Elijah: “Daddy, why did God make Adam first, not Eve?”
Me: “I think God wanted to establish an order bubba, that men would be leaders [in the family].”

And I’m not sure where this last one came from…
Elijah: “Why did God make Satan?”
Me: “Well,… because God wanted to show his wrath against evil and sin I think.”

I didn’t expect to have to think that hard that late in the day!