Hi, (sorry if this is a stupid question)
I was wondering if when I install Leopard I will lose all my documents and music and pictures and stuff or if when I install it everything will stay the same where it is?
you can choose between
upgrade (i won't do that)
archive and install (all your files are saved and you have leopard)
clean install (the best actually but doesn't save files so you will need to backup everything)
No, but a lot of folks just prefer a clean start. Personally, all my upgrades have been just that (upgrade vs clean install) and I have never had a single problem or issue crop up. It's more a matter of how much mucking about you want to do post install to restore apps, etc.
There's no "right" or "wrong" path here, just your preference & time available. Also, remember this isn't Windows, where clean installs are almost a requirement because of the multitudinous issues arising in most upgrade scenarios.
If you really can't decide which is preferable, then an "Archive & Install" may be your answer. It will retain everything without wiping your drive, but give you a perfectly fresh Leopard install.
"upgrade" used to take a looooong time compared to the other options -- 4 to 5 hours, iirc. I think it's gotten better over the years, but I still prefer "archive and install" as a nice middle ground. It leaves you an easy escape route if the install doesn't go well.