u/QuickRazzmatazz8404

I just purchased this Bonneville, with some issues. I driven it for a couple of weeks. there are leaks around the valve covers and powering steering pump and hoses. the Transmission makes a loud clicking sounds in the morning during the cold start. Not sure what that could be, but I really don’t know where to start? should I start with the Transmission then the engine leaks? the car does started to ride rough and the check engine light turns on and then goes out after a while of driving it. Managed to pull a code #13 from the Check Engine blinks.