Lost Drivers?

Hey, guys. I'm sorry, I couldn't run the Vanilla installation. I just couldn't quite understand it, and there were so many things I had to do/run. Don't call me stupid or anything, I just didn't know what to do. That's all. But let's ignore that. I'm posting this because I ran the usual installation (distro) and it works perfectly! Except it doesn't

You see, I'm missing 3 things. #1 A wifi driver (wifi isn't available now on my High Sierra) #2 my External hard drive won't be read and #3 my display is wide, and there is only a 720p setting.

so I think I might be missing some drivers

Don't yell at me for not installing though Vanilla, I'm sorry. I just need to know where I can find the drivers and how I can install them once I've obtained them.

HERE ARE MY SPECS:

LENOVO

Processor: Intel Core i5-6400 CPU @ 2.70GHz 2.71 GHz

RAM: 8.00GB

ST: 64-Bit

GPU: NVIDIA GeForce GT 730