This stickied thread here provides some good answers and resources:
http://chipmusic.org/forums/topic/3988/
hip-music/
A stickied thread is usually stickied at the top of a forum because the moderators deemed it to be useful. You'll still have to read it, though.
Most of the software mentioned therein has tutorials, sometimes even in the form of a video-tutorial. There's a website called "youtube" you can search for keywords, like "famitracker tutorial", for example. Like so:
http://www.youtube.com/results?search_q
arch_type=
If you can't find what you are looking for there, a multitude of search-engines (websites which index other websites by keyword and order them by popularity and relevance) is available which you can use. The most popular one is called "Google". Here's an exemplary link:
http://www.google.de/search?q=milkytracker+tutorial
Finally, this forum also provides a search function (located in the upper right-hand corner) which may be used for a keyword based search. There's a wealth of information on just anything about chipmusic to be found. Internet forums serve also as a repository of knowledge, aside from their social function.
If you have further questions, feel free to ask. Just remember to make use of the aforementioned services too, and do not be discouraged should the results not match your expectations on the first try; as a musician, I am sure you're familiar with the process and reward of refining results.
Good luck and have fun!