Film Opening Task - Developed Idea

For my main film, I have to create a 2 minute film opening. In my small group we came up with around three ideas and one of which we developed further, and could potentially be the film opening storyline in which we record. Our film opening will be of action/thriller genre, this is because it seems to have specific convention and therefore, will be easier to portray when recording. Also, the target audience will be ages 16+ because the film may be distressing or have bits of violence in it, even though the film opening doesn't.

My groups and I initial developed idea's storyline starts with two rival gangs getting ready for a meeting with each other. However, one separate person receives a text with co-ordinates of the location in which the meeting is going to take place.
The second part of the film opening involves the gangs exchanging a briefcase. However, the audience don't know who is exchanging or what they're exchanging.
Towards the end of our film opening it will show one gang leaving with the briefcase, however, the person who earlier received the text tries intercepting it and a chase between the two occurs. This shows the disequilibrium and therefore, sets up well for the rest of the film and leaves suspense for the audience.

Log Line 25 word summary - Two opposing gangs exchange a mysterious briefcase in a sketchy setting, but a stand alone hero appears to have other ideas.

The film opening setting will possibly be in an underground car park, where the two gangs exchange the briefcase. This may be a good setting for the deal to take place as it may have low lighting and their won't be much sound which will hopefully create more tension throughout. However, at the start of the film it will show the individual character receiving a text in an unknown setting. This is because the opening doesn't want to reveal anything about who this character is or what he's doing. Also, the chase at the end when someone tries to intercept the briefcase will be on the streets. This will make the film opening more realistic and gives you a lot of room for different camera angles or different settings to use whilst the chase is happening.