tracing my roots

hello my name is charles christopher i need some help in finding my ancesors, from norway heres what i know that my family got on a ship named celtic and departed from liverpool july 23rd 1902 and arrived in the usa on august 01,1902 i cannot find the ship they travelled on from norway to liverpool. ther names were john christopher margrette, elsie, katrini, harry, mellord and another john i would like too find out everything i possibly can but im stuck so if theres anybody out there that reads this and can help in any way would be greatly appreciated. i have always been very proud of my norwegian roots and would like to share everything find with my family thank you charles e christopher. p.s. you can instant message me on msn my name is skard thanks