Screen ratio is ok. Just go with the one you like, 4:3 or 16:9.
Low sens is quite good, you just need to get used to it.

Hardware wise, you can consider getting a good mouse and good monitor which have high fps.

Other than that, just keep practicing.

You can go search how to get used to low sensitivity and how to find the correct sensitivity for yourself. There are a few videos or threads out there in the internet.

This post has been edited by ck.chunkeat: Jun 10 2015, 07:03 PM

I play on a laptop/ cheap logitech mouse. it's fine. Just continue playing with what you get as you don't necessarily need good hardware to be good.

You can consider getting those hardware if you are very very serious about the game.

This post has been edited by ck.chunkeat: Jun 10 2015, 07:05 PM