Not Sure What To Do About Father's Deathfuneral Etc

I am 26 years old and just found out yesterday thats my Dad WAS Killed in a car accident. He Died in Arkansas, goal he lives in Oklahoma. I live in Kansas. The Truth Is That in my 26 years I Have only seen him / her a few "times. He Lived with us Until I Was 3, Then I saw HIM again at 5, And Then not again Until 23, And Then one last time at 25. I really do not Even Know His family did all. I Have Been Here in KS with My mom My Whole Life. His former wife has-been calling me telling me It Is up to Me to Decide What To Do With him (buried or cremated) then I Have to make funeral arrangements. He Owns Which Will Be Divided property Between Me And My Younger Brother and sister half. I feel very uncomfortable about all of this and feel it isn't fair sincere I really didn't Even Know HIM well at all. There Is No Way I Can go down to Arkansas to sign a paper to Cremate Saying HIM and I do not want To Have Them fax it to my work Either. His ex wife wants me to Talk to the funeral home and ask 'em if I Can Just Have Her Sign the paper. Does It Have to Be really all up to me I really WAS sincere Hardly a part of His Life?