Opel Omega A 2.6 Dual Ram starts very hard / not starting

Tomorrow Leutzz!!! Was on Saturday at the Schrotti and got me a new distributor cap with him. Unfortunately she was also broken. Then I changed you and now we come to the problem. Did the plugs and I had to somehow get on it again on the ignition distributor:-) So now I tried to do you in the order as you were, unfortunately it was wrong and there was a bang and above the engine (air channels) or as the thing at the top of the engine is called and qwalmt wi e crazy.And he is now also leaking at the top of the rubbers. Sorry but I couldn’t describe it better. Has just given a loud bang and where the seals are at the top of the engine(think about the valves, but I’m not sure. Motor turns but doesn’t start yet. Could you give me a tip, how or what I have to do. Or I broke the engine. Or do I just have to replace the whole stuff where Dual Ram is on it, so the complete thing s da. Thanks and sry for the unapproachable description but it is not better, so not from my side.