it will cause far more problems than it could ever solve
only possible reason to use norton on a mac would be for some high security organization with sensitive info
for hte average user, there's no such thing as a virus on macs

iWorks will cover most of those word processing needs. i thought it came with the mac anyway though? it's like the mac equivalent of Microsoft Office - word processing, spreadsheet, database, presentation. lots of templates for making business cards

Text Edit is just a very basic word processor in comparison

don't know about logic

Microsoft Office for mac is quite a good thing to have too