From the nature of your questions it appears that a Post -Nuptial Agreement is what you are seeking rather than a Separation Agreement. If you intend to continue to live together as husband and wife then a Separation Agreement is inappropriate. All the other matters that you mentioned can be addressed in the Post- Nuptial Agreement which must be prepared by an experienced, matrimonial attorney in the New York. The matters are too serious to leave to self-help.
Please call me at 212-370-1660 to arrange to meet together and discuss the matters at greater length.
Leonard M. Weiner, Esq./Divorce Solutions