Lucinda, I am a hobbyist who enjoys studying WWII, and sharing history/research info with other novices. Until you receive a response from an expert researcher, or until you secure the services of a professional, here is some info you might be able to use. Some are resources I have used researching my own family, others are those I have only read about, or found online. Please be sure to verify all to your own satisfaction.
You should be able to get some info from his personnel record through the NPRC in St. Louis. (They had a disastrous fire in 1973. However, they indicate that Navy Dept personnel records - which includes Marine Corps personnel - were not affected.) Info on that resource can be found at this web page: http://www.archives.gov/st-louis/military-personnel/index.htmlhttp://www.archives.gov/st-louis/military-personnel/index.html
You can also send for his Individual Deceased Personnel File (IDPF). As others in this forum have addressed, the info found in an IDPF can be graphic. If you pursue this resource, you should be prepared for that possibility. Send your request to: US Total Army Personnel Command ATTN: TAPC-PAO (FOIA) 200 Stovall Street Alexandria, VA 22332-0404 Be sure to cite the Freedom of Information Act in your request. (The above references "Army" but personnel at this command told me via telephone that they also hold Navy/Marine IDPF's for WWII.)
Incidentally, I looked him up in the National Archives KIA database and his rank there is listed as Private First Class.
Also, you said you wanted to, "find out the name of his ship and station". I'm not sure I understand what you mean. Though, as a marine, he could have been part of a ship's personnel, if he was a PFC or corporal killed-in-action on Okinawa the odds are pretty good that he was in a Marine Corps infantry outfit. 1st Marine Division and 6th Marine Division sustained the majority of casualties on Okinawa, with 2nd Division also suffering some losses.