Will a child support/visitation agreement still be legally binding if you write up your own?

Question Details:

My boyfriend and his children's mother have no type of written agreement concerning their children so she feels that she can "run the show." I suggested that they should draw up and sign some type of agreement so as to prevent the childish shows that happen all the time. I can go into more detail if necessary but I really just need to know if an agreement is written and they both sign it as well as get it notarized, will it be a legally binding contract even though a lawyer was never consulted or involved? Will it hold up in court, if it comes to that? Is a lawyer required in this type of situation or can we handle this at home?

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