Opening Sequence Of A Thriller Evaluation

From my research I have learnt that in order to make the opening sequence effective, I need to do the follwing;

• create characters simplisticly, so that without having the characters do much, the audience can guess a lot about them.
• give connotations to suggest that it is a thriller, such as particular colours, tense music, create an enigma, etc.
• create a mise-en-scene that would be relevant and significant to the rest of the film, and give the audience clues of this, such as the era through props, or the location through the setting.
• increase and decrease the level of tension and suspense through fast and slow editing, loud and soft music, high level and low level action.
• use camera shots, movements, and angles to give away clues about the characters, their status, the setting, and the narrative.
• keep the audience's attention to make them want to carry on watching, and leave them asking themselves questions about the narrative.