Well firstly you have to understand the way that the information is stored in a Gedcom file. Once you understand that, you are most of the way there. I suggest you look here
http://homepages.rootsweb.ancestry.com/~pmcbride/gedcom/55gc... as it guides you through the principles. Once you know how to traverse the file, you will need to store it. That is where I used access. Hope this helps a little. Regards