I am still trying to make the text thing and I made a script out of a few tutorials:

(script startup cutscene
	(sleep_until (volume_test_objects talk1 (players))15)
	(volume_teleport_players_not_inside hide hideplayers01)
	(cinematic_start)
	(camera_control 1)
	(camera_set cut1 0)
	(sleep 50)
	(ai_attach chief1 cinematic1)
	(ai_attach black start)
	(camera_set cut2 0)
	(sleep 50)
	(camera_set cut3 0)
	(sleep 50)
	(if (= (player_action_test_primary_trigger) 0) (camera_set black 50))
	(if (= (player_action_test_primary_trigger) 0) (sleep 50))
	(if (= (player_action_test_primary_trigger) 0) (show_hud_help_text true))
	(if (= (player_action_test_primary_trigger) 0) (hud_set_help_text obj2))
	(if (= (player_action_test_primary_trigger) 0) (player_action_test_reset))
	(if (= (player_action_test_primary_trigger) 0) (sleep_until (= (or
	(player_action_test_jump) (player_action_test_primary_trigger)) true) 15))
	(if (= (player_action_test_primary_trigger) 0) (sleep 2))
	(if (= (player_action_test_primary_trigger) 0) (camera_set chief1 50))
	(if (= (player_action_test_primary_trigger) 0) (hud_set_help_text obj3))
	(if (= (player_action_test_primary_trigger) 0) (player_action_test_reset))
	(if (= (player_action_test_primary_trigger) 0) (sleep_until (= (or
	(player_action_test_jump) (player_action_test_primary_trigger)) true) 15))
	(if (= (player_action_test_primary_trigger) 0) (sleep 2))
	(if (= (player_action_test_primary_trigger) 0) (camera_set black 50))
	(if (= (player_action_test_primary_trigger) 0) (hud_set_help_text obj4))
	(if (= (player_action_test_primary_trigger) 0) (player_action_test_reset))
	(if (= (player_action_test_primary_trigger) 0) (sleep_until (= (or
	(player_action_test_jump) (player_action_test_primary_trigger)) true) 15))
	(if (= (player_action_test_primary_trigger) 0) (sleep 2))
	(if (= (player_action_test_primary_trigger) 0) (camera_set chief1 50))
	(if (= (player_action_test_primary_trigger) 0) (hud_set_help_text obj5))
	(if (= (player_action_test_primary_trigger) 0) (player_action_test_reset))
	(if (= (player_action_test_primary_trigger) 0) (sleep_until (= (or
	(player_action_test_jump) (player_action_test_primary_trigger)) true) 15))
	(if (= (player_action_test_primary_trigger) 0) (sleep 2))
	(if (= (player_action_test_primary_trigger) 0) (camera_set black 50))
	(if (= (player_action_test_primary_trigger) 0) (sleep 50))
	(if (= (player_action_test_primary_trigger) 0) (show_hud_help_text true))
	(if (= (player_action_test_primary_trigger) 0) (hud_set_help_text obj6))
	(if (= (player_action_test_primary_trigger) 0) (player_action_test_reset))
	(if (= (player_action_test_primary_trigger) 0) (sleep_until (= (or
	(player_action_test_jump) (player_action_test_primary_trigger)) true) 15))
	(if (= (player_action_test_primary_trigger) 0) (sleep 2))
	(if (= (player_action_test_primary_trigger) 0) (camera_set chief1 50))
	(if (= (player_action_test_primary_trigger) 0) (sleep 50))
	(if (= (player_action_test_primary_trigger) 0) (show_hud_help_text true))
	(if (= (player_action_test_primary_trigger) 0) (hud_set_help_text obj7))
	(if (= (player_action_test_primary_trigger) 0) (player_action_test_reset))
	(if (= (player_action_test_primary_trigger) 0) (sleep_until (= (or
	(player_action_test_jump) (player_action_test_primary_trigger)) true) 15))
	(if (= (player_action_test_primary_trigger) 0) (sleep 2))
	(fade_out 1 1 1 30)
	(object_destroy chief1)
	(camera_control 0)
	(volume_teleport_players_not_inside hide showplayers01)
	(cinematic_stop)
	(fade_in 1 1 1 30)
	(player_enable_input 1)
)

I think there's a problem with it because whenever I try to compile it I get this error:

[cutscene3 line 1] only static scripts of the same type can override stub scripts.: (script startup cutscene
recompiling scripts after scenarios were merged.
this left parenthesis is unmatched.: (script startup cutscene

I don't know how to fix this error, I just started scripting a few days ago.

Look for another script with the same name earlier in your code. Change one of the names. Also, make sure there aren't any other halo script files which could interfere withe each other in the same folder.

Thanks I had to make sure I had the black and chief1 camera points and change cutscene to cutscecne3.