#1 Maybe you don't have a AGP slot only a PCI slot.
#2 You must be dual-booting to get the 30sec countdown. To change this right click on my computer and choose properties. Click on Advanced and click setting in Start and Recovery. There you will see Time To Display Operating Systems with the default of 30sec.
#3 Yes you need to get in the BIOS and disable the start up screen (Apitiva Screen)
If I were you I would get a new PC. Yours is very old and I certainly wouldn't buy a IBM, they are very cheap and low end. They are the worst I've ever seen.