Processing Audio Files for Radio Broadcast & Archive??

You may not haven't received any answers yet because your question is so broad. The typical answer would be 'How long is a piece of string'. It is very difficult to be specific without writing a whole book about audio. So just as a start here are a few suggestions. normally if you are supplying to an end user they will have specific requirements and rules as to what form and how their audio is delivered to them.

However for Archive purposes you need to do as little processing as possible. Don't worry about all the bells and whistles in Audition. You only need to use them when necessary for cleaning up or shaping audio for a particular sound. audition's help files should give you some basic information about all the included effects. But you may also need to do some studying of online tutorials and also search the internet for more in depth explanations of some of them.

For Archiving basically only normalise audio levels to make as much use of all the digital bits as possible, usually to about peak levels of say -3db. This preserve all of the available audio content and will allow any future access to the file to have a much information to work with so that a later user to can make their own mind up as how to process the audio. You should always store the audio as .wav files with at least 24bit 44.1kHz or 48kHz sample rates for the cleanest representation of the original audio signal.

Remember than that .mp3 should only be used for final distribution for listening purposes, not for storage, as it is a very lossy format. Requirements for other uses depend entirely on how the end product is going to be distributed and listened to by the end user. it also depends on the content of the audio material, whether it is music or speech and how much dynamic range is required at the far end of the chain.