You can hook up your Korg MIDI with a USB connection. For audio you can buy an USB to stereo audio input device for under $10: http://www.amazon.com/Sabrent-External-Adapter-Windows-AU-MMSA/dp/B00IRVQ0F8/ref=sr_1_3?ie=UTF8&qid=1418264218&sr=8-3&keywords=usb+audio+input

This along with the appropriate cables will get you going assuming of course that you have enough USB inputs on your laptop. Otherwise you will also need a MIDI hub: http://www.amazon.com/Rosewill-4-Port-Power-Adapter-RHUB-210/dp/B00552PMN8/ref=sr_1_3?s=electronics&ie=UTF8&qid=1418264465&sr=1-3&keywords=usb+hub+with+power+supply
Be sure to get a power-supplied hub. The above one is only $15.

BUT this is just a temporary fix. As you progress you will find that you will want a better sound system for your laptop. There are many to choose from such as Fostex, MOTU, Roland, etc. But for now the above will get you started very inexpensively.

I hope this helps.

Whenever I get something stuck in the back of my throat, I dislodge it by drinking a beer.
It's called the Heineken Maneuver.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware