You need to find something that describes the basics of using Dynamic Memory chips (DRAM); the SIMM is just convenient packaging. Or you might need to start with something that describes using generic RAM at the hardware level (assert chipselect, apply address to address pins, apply or prepare to receive data, assert output enable or write. DRAM adds a step or two because the address bus is multiplexed (apply half at a time, manipulate extra signals), and you have to read each "row" of the chip ever couple of milliseconds or the data decays (that's the "Dynamic" part.) But I don't think I've seen a tutorial like that in quite a long time...