If i am away on erev pesach when do i do the bedikah in my house? Before i leave?

Shalom, Thank you for your question. Yes, if you will not be home for the night of bedikat chametz, then you do it on the last night you will be in the house. In that case though, the bracha before the checking is not recited, although the “kol chamira” nullification statement is said after the checking. Chag Semach.