Looking for grandmother's records

Hi, I am really new to this but am really excited to try it. I have a family tree book from one grandparent already done by another relative (Norway too). I need to know how to start. I have been looking at websites and that has helped. All I know for positive right now is my grandmother's name was Inga Nelson when she came over. I am not positive of the year but hope to find that out soon. I believe they settled in Buffalo ND where she met my grandfather and they married there and also raised their children there, my mother being the oldest and born in 1908 (Cora Anderson). All of a sudden I realize what all I dont know!! I am involved with people in SON and they will help me and my cousin is actively involved in Madison, WI with SON and he will help too as he is the one who did my grandmother's side and he did an excellent job and has visited Norway a couple of times. Thanks for any help you can give me as I am sort of overwhelmed already and haven't started. [xx(]My sister (who has my mother's family history stuff) is supposed to see what she can find for me. [:)] Deb