my lenovo G50-70 supports egpu with 1080ti or 10604gb grafic card

Solution
Best thing to do is sell your laptop and get one with a gaming video card already included.
By the time you crack open the case, get the external GPU part, buy the video card, buy the power supply for it, get a monitor to connect the card to, probably would need to remove the WiFi onboard card to stick the external GPU connector to, then you will also be stuck at 1x PCIe speeds, it is not worth the hassle or the mess it will make.

A decent gaming class laptop would be about $700-1,000 not much more than what you want to do and will work a lot better.
Best thing to do is sell your laptop and get one with a gaming video card already included.
By the time you crack open the case, get the external GPU part, buy the video card, buy the power supply for it, get a monitor to connect the card to, probably would need to remove the WiFi onboard card to stick the external GPU connector to, then you will also be stuck at 1x PCIe speeds, it is not worth the hassle or the mess it will make.

A decent gaming class laptop would be about $700-1,000 not much more than what you want to do and will work a lot better.
 
Solution