OK - a couple points. what mac? if it is a G3 or better, upgrade to OSX and then you can build Apache, MySQl, and PHP all in it and go from there. If not, there are otehr options. FileMaker Pro is an EXCELLENT database. AppleScript works well for automating things and you can also use MacPerl if you like Perl.
Excel is not a database application. It is a spreadsheet. While they share some common things, they are not the same and can function quite differently. email me if you think I can help further.