Hello, I'm running JaS 10.5.4 and need help with a few things.

First off, let me just say that I have leopard to a point that it'll actually boot up. The last distro I tried (iDeneb v1.4 IIRC) would get a kernel panic right as it was booting up. In this JaS 10.5.4 distro, it boots up, runs, and generally works. (Audio too.)

However, here's what I need help with:

EDIT: I got the graphics working pretty well on here now, I'm generally satisfied with it. My only problem now is trying to update, that's why I have this topic in the installation section...

Second thing is:
I want to upgrade this to 10.5.7. I looked around, and I generally understood some posts, but the rest I didn't learn much, so help with this would also be appreciated. (I know just running the software update will crash Leopard, so I'm not doing that until I know how to do it properly.)
(Edit again; I read the "official upgrading to 10.5.7" thread, but I didn't quite understand it. If I didn't have what it said I needed, where should I get it from?)
Here are my computer specs:

Intel Pentium 4, 2.4 GHZ CPU (Which by the way, Leopard thinks is a 3.2 GHZ)
1.5 GB RAM
Motherboard is a "IBM 819 4A1U"
Audio is one of those AC97 ones, works just fine.
Graphics card: GeForce FX5200, AGP, 128MB
Chipset is an Intel 82801EB ICH5

If any more information is necessary, I'd be glad to get it.
Help would be greatly appreciated =D

Updated the first post... Please help? D=