I cant remember what I did with mine. Was the app. sent to you in PDF form or was it sent in the mail? If it was sent to you electronically, then I would fill it in on the computer. If it was mailed to you, I would write it in very neat and clear block letters. Do typewriters even exist anymore??
In the autobiographical section I wrote my short autobiography. Flying history, job history, and added in some recent family history (marriage). If I remember correctly, they want you to indicate if you are planning to commute or not. In my opinion, this is a little bit of a trick question. You are applying for a job that is a commuting contract. I would be leary of saying you are not planning to commute. A lot of questions they ask you will come from what you write there so make sure its accurate.