For you must watch 6 movies, you should watch in the following order:
1. Star Wars
2. The Empire Strikes Back
3. Return of the Jedi
4. Raiders of the Lost Ark
5. Indiana Jones and the Temple of Doom
6. Indiana Jones and the Last Crusade
For you must watch 6 movies, you should watch in the following order:
1. Star Wars
2. The Empire Strikes Back
3. Return of the Jedi
4. Raiders of the Lost Ark
5. Indiana Jones and the Temple of Doom
6. Indiana Jones and the Last Crusade