all depends of the fitment of the ronal's , the Mk4 golf has a PCD of 5x100 if i remember correctly, so chances are that you may need some PCD adapters, available from various places. These will convert the mk4's PCD of 5x100 to the required fitment for the new wheels. however because u said they are Audi s4 alloys they may fit fine, but not sure.
As for the suspension question, as far as i know they will fit fine.
