Using Razer eGPU with 3D part laptops ?

Hi, I need an advice.
I have my Asus N76VJ laptop with this specs :

Processor Intel Core i7 3630QM Windows 8 Chipset
Intel HM76
Chipset Memory DDR3 1600(0.C.) MHz SDRAM,
16 GB Display 17.3" 16:9 HD+ (1600x900)/Wide View Angle LED Backlight Graphic NVIDIA GeForce GT 635M with 2GB DDR3 VRAM Storage 2TB HDD + 500gb SSD
Storage 2TB HDD + 500gb SSD

It is any affordable option to make it a machine for 3D editing & 4K video editing.

I hope you will help me a lot with advice what do I need exactly (models) to install or buy.
(Like external eGPU for example)
My budget is around 500$ +/-