Realistic Animation Integration

I have a script and characters ready; I just need them animated into a video. Requirements: - Realistic animation style - Final output in MP4 format Ideal Skills: - Proficiency in animation software... (Budget: $250 - $750 USD, Jobs: 3D Animation, 3D Graphic Design, 3D Modelling, 3D Rendering, After Effects, Animation, Character Animation, Video Services)