Leds will not make your environment better. At best they are a distraction. Bigger monitors with higher resolution, over-ear noise canceling headsets, comfortable seating, the right keyboard and mouse for your comfort and play style. Gaming environment is all about immersion, sinking into the game. Not stuff that's going to pull you out of it like flashing lights.
Kb and mouse are very important. Spend the time to travel to different pc equipment stores and physically put your hands on them. Find one that has the right feel to it, keys are spaced right, buttons are good, fits the palm comfortably. Getting those 2 wrong can make or break gaming enjoyment and ability. Fancy brand names, gimmicks like rgb are nothing compared to...