How to begin making my own ISP?

I want to begin making my own ISP, mainly for high speed servers and such, but also branching out to residential customers. I'm going to be in Germany for the next school year (probably either Frankfurt am Main or Berlin); any suggestions on what sort of classes I can take there that will be in English and will teach me all I need to know on how to build and manage my own ISP, AS, etc? Thanks.