Disclaimer:
This is my first post and I'm not great at English at all so If I typed grammatically wrong, I really apologize.
A workstation is a special computer designed for technical or scientific applications. Intended primarily to be used by one person at a time, they are commonly connected to a local area network and run multi-user operating systems.
Chapter 1: Minimum Requirements.
Before you list the spec, please check out the minimum spec requirements from each software if you are on the budget.
After Effects CC: https://helpx.adobe.com/after-effects/system-requirements.html
Premiere Pro CC: https://helpx.adobe.com/premiere-pro/system-requirements.html
Blender: https://www.blender.org/download/requirements/
Vegas Pro: http://www.vegascreativesoftware.com/ca/vegas-pro/specifications/
Maya: https://knowledge.autodesk.com/support/maya/learn-explore/caas/sfdcarticles/sfdcarticles/System-requirements-for-Autodesk-Maya-2017.html
Chapter 2: How to list spec?
CPU: Adobe Programs - Get highest clock speed as much as possible (4.7GHz is recommended)
Vegas/Maya/Blender - Get high core count and clock speed (8 core 16 thread is recommended)
GPU: Adobe Programs - Get nVidia GeForce graphic cards without Ti version or nVidia Quadro or AMD FirePro only!
Vegas/Maya/Blender - No particle GPU.
Ram: 16 GB DDR4 is recommended
PSU: 80+ Gold certification is recommended
Storage: 512GB NVMe M.2 SSD is recommended
$1000 workstation
https://pcpartpicker.com/list/7kZqcc
$2000 workstation
https://pcpartpicker.com/list/Lrjqcc
Chapter 3: Start building.