Building a synthesizer with no prior experience
There is plenty of interesting info at the Music From Outer Space website. Including circuit schematics accompanied by detailed explanations of the designs. As well as a range of advice and links relevant to building synthesizers. 

You'd be better off first gaining experience with some simpler audio electronics projects, and building up the skills and equipment that a major project like this would require. Then you'd be in a better position to evaluate how/whether to proceed further.