Edit existing video clips for project

Hi, We have three small videos that require editing. The edits we need include: Changes to animation effects - duration and actions of movement and light (flashes etc) Changes to logos - colour schemes, styles and effects Edited duration of videos - e.g. our ending needs to be slightly extended. Our desire for this project is to find someone who can simply refine our existing videos to make them meet the 'look' we are seeking for our brand.