I131 filling questions

I am a bit rushed in I131 application, and mess up the flow.

I have already purchased the air ticket, then realized I can only leave US after I do the finger prints, not as what I thought just filled it and received the receipt letter.

The ticket is for 4/4/2015, Do I have chance to get FP before the date?
May I fill I131 in local USCIS office and get speedized on process even on fee based?

Normally how long FP apt will be set after filling?

Also what is the better way to fill in Part4 1.a. "Purpose of the trip." if I intend to stay aboard for more than a year?

waiting on line for suggestions and answers.

thanks a lot,