Hans Knudsen Studsvik

New and with limited knowledge of Norwegian genealogy, what I have found on my mothers grandparents from Norway - Hans Knudsen Studsvik, born 1876 Tysnaes. Immigrated to America in 1905. Brother Kristian, born 1871 Tysnaes also immigrated in 1892. Hans father was Knud Larsen and mother was Christine Johnsen. Hans wife was Helene Marie Halvorsen, born 1876 in Manger parish. Her father was Halvor Andersen and mother Marie Mikklesdr. Hans and Helen had two sons - Leif Dagfinn born 1904 Askoen and Hilmer Martin born 1906 Bergen. They immigrated in 1907 and joined with husband in Tuolumne, CA. Would appreciate direction on where to go from here to determine family history in Norway, hopefully locate descendents, and determine if other family members may have emigrated with possible descendents in America as my line had all died.