Below are 10 ideas for starting your questions:
What is . . .
How do/does/did . . .
What procedures or actions . . .
What problems . . .
What happens when . . .
What is/was the role of . . . in . . .
What is/was the difference between . . .
What causes/caused . . .
What are/were the effects/results of . . .
How/why did . . . decide to . . .
Who/what influenced . . . to . . .
What is/'was the relationship between . . . and . . .
What are the competing sides . . .
How does/did . . . change . . .