Fiance Visa Graduate

I'm mailing the fiance visa paper work on Monday. I just need to know besides, I-129f,325-A,pictures,airplan tickets,etc what else is needed. Just last night I was reading somehting about typing a statement "Intention to Marry" is this necessary? and if so do we both do it? Also, is mailing OK'. My boyfriend thinks I should deliver them myself and have someone verify that I actually did everything right.(like that's possible).

I'm mailing the fiance visa paper work on Monday. I just need to know besides, I-129f,325-A,pictures,airplan tickets,etc what else is needed. Just last night I was reading somehting about typing a statement "Intention to Marry" is this necessary? and if so do we both do it? Also, is mailing OK'. My boyfriend thinks I should deliver them myself and have someone verify that I actually did everything right.(like that's possible).