read through the basic installation procedure of whichever distribution (redhat, or debian, etc.) you decide to use, preferably debian (same as what we all use).
isa slots (e.g. what's a pci slot, isa slot, etc.)
isa slots, closeup view
make sure sideways and easy to work on
can cut out plastic over cover.
above all (active not yet)
world's first microprocessor was Intel 4004