Firefox bookmarks can be backed up very easily from the Menu bar. Click on 'Bookmarks', then click on 'Show all bookmarks'. This brings up a box called 'Library', in the middle at the top, you will see a command 'Import and Backup'. Click on this and you will have the choice to either back up the bookmarks or export them as HTML. Both work, and you can choose where to save the resulting file - a memory stick would be a good place. Then all you have to do is reverse the process in your new computer.
Word docs can be transferred the same way, just use Windows Explorer ( right click on the 'Start' button, left click on 'Explore' ) ( or click on the 'Win Explore' icon on the taskbar ) to drag and drop your documents to a memory stick or portable hard drive and then drag aand drop them onto wherever you want them in your new computer.
I can't apeak for Outlook, I don't use it, but the files it generates can be moved in exactly the same way as Word documents. I would suggest you do a backup on your contact list as well.