Alright, first you wanna pick up a controller. Since your a beginner I recommend something cheap like an M-Audio Oxygen 8 or something along those lines.

They will work off of usbmidi which means it transfers the midi data not through a midi cable but a usb cord. Just plug it in, go to options/midi and choose the midi controller you got.

Then start creating music! Load in the instruments and drums you want and you can control/record them with your new midi controller!!