You should have done your mouse research before buying a mouse. Its like buying some bullets and then wanting to know how they work. At least do your research on that mouse and what pads it works with or doesnt, yes mousepads dont work with certain mice, and monitors, and w/e else Im not an expert.
There is so much to cover in regards to mice but the basics are 6/11 windows, turn off acceleration in windows, maintain 60fps and never use vysnc cuz it causes lag, then use MarkC acceleration fix which removes more acceleration that is in windows that doesnt turn off (its a registry fix), then highest dpi with lowest sensitivity is generally better then the opposite. You are also going to need a massive mousepad because most FPS is played with your arm and low "sensitivty" with your hand being the fine tuning tool as opposed to RTS where you use the ball in your hand as a pivot.
But thats just the start because each mouse and mousepad and how they interact has many many many values. And there are a ton of other mouse variables which need looking at. Some mice use prediction, have negative acceleration, pickup height, lazer vs optical, etc. Some have errors when you move too fast, some break easy, some you use their software some you don't, etc.
Besides your actual mouse and mousepad you have to make sure your graphical settings are proper and that you can maintain 60fps in even cluttered explosion ridden areas, and of course internet. I don't know the fine details but a CRT monitor or a 120hz monitor with low input lag is very important. And if you have 120hz you need to maintain 120fps+ and I believe its 124fps since 62fps is the number for a 60hz monitor. You also need fast g2g response time besides this.
I also am pretty sure 1680x1050 is bad but I can't remember. I could be wrong though it might be better. I swapped to 1920x1080 because its best for starcraft 2 in the amount of visible area you can see, I don't know if 1680 lets you see more left to right since those are more valuable then up and down usually. And inside of this you need to calculate your FoV that you like most, I generally prefer a more narrow FoV than a fishbowl wide FoV due to the fact that I play sniper or battle rifle type classes and it basically provides magnification.
The other most important thing is dont be fickle. Don't set up some mouse settings and after a few hours change then back or to something else entirely. Play with your current settings for AT LEAST a week of 20+ hours gaming and then evaluate if you need changes.
Also get some headphones so you can hear things. People who play FPS without headphones, esp those on voice chat are SO annoying... besides putting themselves at disadvantage. Being able to hear people is a major tactical advantage over those who blast dubstep and have dortio bags crinckling.
Also ESreality is where I got a lot of my info among other places, but I only really know the specifics for starcraft 2 and dont know much in the FPS gaming land.
Also Black switch keyboards for FPS, brown for fps, red > black I think but rare, you probably need NKRO since ur FPS player
That should be enough to frustrate you for a few days. There is a mechanical keyboard guide on here thats very very good as well.