Wow! Is this the response I will get as a beginner if I ask a question? I am scared and perhaps I should be.
No, you shouldn't be scared. I believe the thought behind the suggestion was that because this seems to be a fairly major event, the pictures are important. Given that you're asking for suggestions on lenses and flashes, it can be assumed that you're not overly experienced, therefore, hiring someone is one way to ensure you get good images.
Assuming that you don't want to hire someone, and without knowing details such as location, distance, time, etc, my recommendation would be to rent a 24-70 f2.8 and two speedlights with reflector umbrellas and stands (Sorry, I don't speak Canon, so I can recommend a specific speedlight).
I would probably try and position one flash about 45 degrees right or left of the area where the subjects will be and have it set to full or fairly high power, and the second at relatively low power just off centre. You may need to move things slightly to ensure that the flashes can 'talk' to each other.
Set this up a day or two ahead of time and spend a couple of hours practicing at about the time you will doing the real pictures, with the ambient light as close to where it will be on the event night as possible. Adjust your settings 'til you get the results you want, write everything down, mark the positions of you and your lights, and then on 'game night' set-up will be a matter of minutes and you should turn out good, albeit cookie-cutter images.