On of the easier steps is to follow the family from the known person in the census back. Then check the rootweb and LDS listings for the people. Then the next step likely is the collection of data from marriages, deaths ect to work your way back in the line. After each clue has been followed up on, you will slowly work your way back to lines that have been worked for the Alden family. Depending on the line, you may have to only go back about three generation or four to match up to a line.