>>will it just pick up the changes since I have cataloged them into ACDSee?<<
It will pick up the changes at this point

but it would not do so had you tagged items etc If you are going to move or delete tagged items you need to do them within ACDSee
>so I am copying all of my kits that are on CDs to it and when I let it "Catalog my Files" those items were not on my computer<
It should pick up the new images but it depends on your setup - as long as they are on your main harddrive though (not an external) it should see the additions automatically (though you may need to restart ACDSee if you were adding the kits while Acdsee was still open)
HTH
