Hi if you still need this here you go.
Keyboard
Razer Huntsman (I would suggest spending the extra money on the elite but your own call as the wrist rest is super nice) - The new razer switches are nice if I was running off a 3-year-old Blackwidow Ultimate Chroma and I never knew what I was missing the difference isn't huge but it is definitely there and feels a lot nicer. You can pick one of these up at the max for like 209.00 USD (Might have changed as I was last in best buy looking at these a while ago)
Mouse
Logitech G502 Proteus Core (Unless you like RGB then just buy the RGB one) - I have had my same G502 for the past 5 years, and had no issues, while yes it is probably time for a new mouse(Which I have a plethora of) I always find myself coming back to my original G502 for reasons unknown, I would imagine it is just because it is so familiar to me. I have the RGB G502 but the added weight of the proteus core edition has a much nicer feel in my own opinion, it has like 6 programmable keys or something (might be 5 idk) but that is more that anyone could ever need in a mouse unless your playing swtor or WoW, it's quality, and not too expensive you can pick one up for around 60 USD.
Headset
This is the most important thing I will ever say about a setup build. DO NOT buy a headset, spend the extra 40 dollars on a quality microphone and you will be much happier, even a blue snowball which you can pickup for around 40-60 USD is going to have a much higher quality than a headset, then just plug in some headphones to your PC literally any headphone will do, personally i use my Beats Mixr's but you could use the apple earbuds for crying out loud and you will have a much better sound quality, and a better investment, as your microphone is going to last much longer than any headset you buy. Generally, I would suggest a yeti microphone and one of the 120 USD ones if you are having budget constraints just go with the blue snowball it still has a really good quality compared to anything you will get from a headset and is fairly cheap coming in at 40-60 USD.
Hope this helped, if you bought a headset I would suggest getting rid of it and buying a mic so you dont have to replace the headset every 1-2 years