I took the easy way out - my Linux box has been "retired" to under the spare bed to make room for the Chrimbo tree but wanted to play :devil:
I d'loaded EasyPHP - comes with PHP, mySQL and Apache pre-configured (you can change it all later, it just installs into 1 directory) and then d/loaded phpBB (dead basic forum software) - installed straight into the www directory in apache and tested it all locally before uploading it, just to make sure it all worked & I knew what I was doing...
I found it dead simple to do, no problems at all, forums are nicely modded as well now! If I can do it, anyone can
Good luck!