Add sounds and "extra punch" to existing Aftereffects animation - repost

I am making an animation for a company's internal kickoff, the animation is going to be used before the powerpoint presentations begin. I am more or less done with the basic animation, and the client is sort of happy with it. Priority #1 - I need help in adding sound to the animation; ambient music and sounds, swooshes, bumps, thumps and other sound effects that enhance the animation. The intended audience are business men of varying age so there can be no break beat frenzy, but still it has to be snappy. Sounds should be added to the "final assembly" comp and in layers that I can change, should I need to, ie. not a single big sound file but individual sounds. Priority #2 - I would need some help in making the animation more "snappy", or professional looking; perhaps better transistions between the comps differently, adding depth, shadows, lights, reflections, blurs, subtle visual effects and elements. You have some freedom as long as you don't over board. I am using Aftereffects CS6, Trapcode Particular Suite 12.1 and Sure Target 2.x All sounds and editing needs to be done using those tools. If you are going to use other plugins, please consult with me first. I will also need to do a one, maybe two other animations for the same client and event, hopefully using the same Freelancer, but I will post that project separately. This job needs to be done by Friday the 11th.