SBLive in PCI slot 3. 
NIC in PCI slot 4.
Update to 1003 BIOS.  Remember to follow instructions before flashing:
ASUS's site says this:
Notice:
If you are going to upgrade BIOS from BIOS version 1001.A (and earlier) for CUSL2 or 1002.A 
(and earlier) for CUSL2-M, please make sure the following item in the BIOS setup menu is set 
at [PCI/AGP] before updating the BIOS.
Advanced -> PCI Configuration -> VGA BIOS Sequence 
In case the system is unable to start up properly after performing BIOS upgrade, please 
remove all the add-on VGA adapters from the system and start up the system with the onboard 
AGP graphics controller or clear CMOS. The add-on VGA adapters then can be installed after loading the 
setup default from the BIOS setup menu.
As soon as you finish installing the OS, make sure you install the 
Chipset inf drivers.  
ATA Drivers are optional....they make a large increase in performance, but if you are going to use CDRWs, I suggest avoiding them for the time being.
You have an SBLive?  Then you need to do the following, otherwise Win98 won't restart/shutdown properly: 
Enable LPT Interrupt Sharing in the SB Emulation Device in the device manager.
Disable the DOS SB Emulation in the device manager (optional).
Set IRQ 5 Reserved to Yes in PCI/PNP Resource Exclusion list in the BIOS. 
Disable Legacy USB in the BIOS. 
If you are not going to use the 2nd USB bracket, you might as well disable it through the jumpers on board.
If you are not going to use the 2nd serial port, disable that in the BIOS to free up an IRQ.