Google is wonderful.
**broken link removed**
Pre-preg is nothing more than resin impregnated board that's stored cool then laminated under high temperature and pressure, do you really need to do a multi layer board? Something like that might be better to outsource to a job shop that can do it professionally, unless you really want to do it yourself. I've not really seen any hobby level project that can't be done on single or dual layer boards with an occasional wire jumper here or there for trace efficiency. If this is a bulk production thing, outsource it, the time spent finding companies that can do what you want and getting quotes to find one that will do it well at a reasonable price is FAR better spent than the research to do it yourself.