How To make an agreement with my current husband(currently separated for 3 months) that will be valid In Court, until divorce.

Hello:
I would like to know how to make an agreement with my current husband. On the following :
* That he will provide spouse support to me his current wife, on a weekly basis for the amount of $300.00 dollars In cash Only.
*stating that If he defaults Once on my weekly support I'm entitle to the rent of $600.00 dollars of the following month.
* That I will give him the monthly rent of our tenant for the amount of $600.00 dollars In cash, for the front room rental.
* That he Authorized me, his wife to be In his current car Insurance with ALLSTATE and that none of us will default on Payments .
* That as his current wife I'm entitle to the back room rent for the Amount of $400.00 dollars per month.
* That he will not default or be late on any current utilities bills & mortgage.Etc Thanx !