Firstly, congratulations!
If you manage to agree on a solution with the other side during the mediation, this will be recorded in a settlement agreement. The settlement agreement is a contract and therefore legally binding.
If you and the other side have lawyers, then usually your lawyer and the other side’s lawyer will draft the settlement agreement. If there are no lawyers, then the mediator may agree to prepare the settlement agreement.
No matter who prepares the settlement agreement, you should make sure that you read it very carefully make sure that it is accurate and says what you want it to say before signing it.