All these suggestions are awful.
Headset:
NEVER get a headset. A headset is just a combination of a pair of shitty headphones with a shitty microphone, then they jack up the price so idiots can buy it. Seriously, get a separate microphone and pair of headphones, I suggest these:
Sennheiser 280 --
Amazon.com: Sennheiser HD 202 II Professional Headphones (Black): Electronics -- Comfortable, extremely affordable, and probably the best low-tier headphones out there (even beats out most mid-tier).
Blue Snowball Microphone --
Amazon.com: Blue Microphones Snowball USB Microphone (Brushed Aluminum): Musical Instruments -- Expensive, sure, but really durable, easily adjustable, and sounds really clear. I get plenty of compliments when I'm using it.
Keyboard: Jesus Christ
just use the one you have. If it's really THAT bad, just get any old keyboard. There's really no reason to spend $100 on a keyboard. I should know, I have a Razer Blackwidow Ultimate or whatever the hell it's called.
Mouse:
Zowie EC1 / EC2 eVo --
Amazon.com: Zowie Gear Optical Gaming Mouse (EC2-eVo White): Computers & Accessories -- I had never actually used one of these before I had my brother buy one for himself. I went over to his apartment, and tested it out.
This is the smoothest mouse you will ever use. The thing just glides across the mousepad. It's heavenly. Not only this, but it also has one of, if not the, best sensors money can buy. The DPI is somewhat low compared to other mice, but that doesn't matter when a mouse is this good.
Mousepad:
SteelSeries 4HD --
Amazon.com : SteelSeries 4HD Professional Gaming Mouse Pad (Black) : Electronics -- Your mousepad isn't the most important aspect of the set-up, but if you have a shitty mousepad that wears 'n tears after a while, then it's going to suck buying a new one. That's why I recommend the 4HD; these things are built to last.
If all of this is too expensive, however, just PM me and I can help you out there.
Then again, you probably won't read any of this. Whatever.