Obtain a digital audio workstation such as Logic or ProTools. These programs are widely available at audio software retailers such as Guitar Center and Best Buy. If these software packages are not within your budget, consider downloading a freeware DAW such as Ardour or Rosegarden. These programs include many of the same features as retail DAWs.
Create drum tracks within your DAW using a drum machine. One disadvantage to freeware workstations is that they typically do not include audio production tools such as a drum computer. Logic, ProTools and Reason each include step sequencing drum machines that operate by assigning individual drum sounds to one of 16 or 24 individual rhythmic "steps." These "steps" represent subdivisions of the tempo you are using. If your DAW does not include a drum machine, consider downloading a freeware step sequencer such as Hydrogen. Explore the sound banks provided with your drum machine to find the percussive sounds most fitting for your production.
Add audio effects such as reverb and delay to your drum music using the effects processors included with your DAW. Freeware and retail DAWs typically include a suite of basic audio effects processors. These tools can be used to add polish and texture to your track. If your DAW does not include audio effects processors, consider downloading Audacity, a freeware audio editing program that offers equalization, editing, and dynamic processing tools.
Convert your drum tracks to usable file formats such as WAV, AIFF or MP3 using the audio encoding tools included with your DAW. Each of these file formats compresses audio into manageable data sizes. Audacity is capable of converting audio drum tracks to these formats if your DAW is incapable.