Jeri,

If you don't mean to assign any special importance to the first position then you don't need to say 'first of all'. You can simply say 'first' which sets the stage for there being a 'second'. When you say 'first of all' you are saying that this case is special and is of prime importance. It stands above 'all' the others. If a thing is second, it logically cannot stand 'above all the others', because you just said the first one did that when you said 'first of ALL'.

Bert.