I can help with this a bit
Keyboard - Presuming you'll be using it alot you'll want something sturdy and mechanical I recommend a Gigabyte Osmium or a Corsair K series keyboard. Any keyboard from a reputable brand will do the trick.
Mice - Playing MMOs? Razer Naga. Playing any other game besides MMOs? The SteelSeries Rival mouses are pretty cool.
Headset (Headphones) - You should buy your microphone separately from your microphone, it'll be overall better in the long run. The newer AKG K series headphones are pretty nice. If not them maybe go for some Sennheiser headphones.
Microphone - Low Budget:
48V Phantom Power
XLR Cables
Any cheap Condenser Microphone will do. (BM-800 is a good one I hear, look up some reviews)
Higher Budget:
For the lazy person, buy a yeti. They're good but not worth the money.
If not then once again buy a 48V Phantom Power Supply
XLR Cables
And a more expensive condenser microphone such as the Audio Technica AT2020 (not the USB version), a Auna microphone or a Behringer microphone!
That's all the help I can give, good luck on buying your equipment