I will soon start a PhD in Politics in Germany. I need advice on how to lay hands on funds in Germany.

Well, as a European student working in another European country, you can apply to the EU for funding and you can apply for additional grants. I don't remember the websites that give you advice on these things, but things like the Marie Curie trust will get you extra cash for working in Europe

i thought education was free in Germany. or am i wrong?

It's free but one needs funds to cover other expenses. Hope am not wrong either.