You don't program microprocessors directly. You program the (EE)PROM that is on their address bus.
Remember BIOS? The uP resets and runs code in the BIOS and from there jumps out to larger memory (CD, floppy, hard drive).
You also need RAM (usually DRAM) to complement any on-chip RAM.
Seems like first step would be getting some BIOS code written.
Sorry for the delay -
First question to ask would probably be along the lines of how is the BIOS constructed? (i.e. is it written in an assembler, and what does it contain in an usual implementation?)
That being established, would it be possible to "use" a micro as a MCU provided it is socketed to the mobo with access to RAM/cache memory and peripheral/IO interfaces?