Damn, I didn't pay attention, they wanted times too? FMR.

My order on left, canon answers to the right:

1. Vader's first appearance - Episode III
2. Luke's first appearance - Episode III
3. Ben's first appearance - Episode I
4. Luke gets lightsaber - It's not really yours until you make your own, so Episode VI
5. Death Star's first appearance - Episode II in concept, III in reality
6. Luke decides to leave with Kenobi & become a Jedi - preordained by the Force, so at the beginning of time
7. Han's first appearance - that was probably him flying the Falcon into the Senate building in Episode III
8. Heroes leave Tattooine - Episode I
9. Alderaan is destroyed - Episode IV
10. Millenium Falcon approaches Death Star - I guess Episode IV, but a future movie set between III and IV may prove us wrong
11. Luke and Leia meet - "Somehow, I've always known"=Episode III. QED.
12. Ben and Vader fight - Episode III
13. Ben dies - one is not truly dead in the Force; trick Question!!!
14. Heroes reach the rebellion - reserved for a future story; see #10
15. Pilots getting in x-wings and y-wings - too broad. I refuse to answer
16. X-wings approach Death Star (with Yavin in bg) - I guess IV, meh.
17. Vader gets in his fighter - I don't know, Episode IV? But was that really the first time in his custom TIE,lol??
18. Han attacks Vader's fighter - more like a sucker punch. The Dark Side is stronger, hel-LO! Like Han could really attack a powerful Sith Lord.
19. Death Star blows up - Episode IV.