When can i learn more..

For guitar building try Melvyn Hiscock's "Make Your Own Electric Guitar"

For good magazines, try Fine Woodworking and American Woodworker.

For more specific info related to woods and instruments etc, try the Musical Instrument Makers Forum at www.mimf.com. Register and get into the archives. That alone should be a book in and of itself.

Lurk and read the Gallery Hardwoods forum here on TB.

As to when? When you get off yer a** and do it!