Setting Boundaries ~ Looking for suggestions

We have a family session scheduled with my son and his counselor this week. I'm writing a letter to let him know how his addiction has impacted me. I am also supposed to include the boundaries I plan to put in place. This feels like an overwhelming assignment. like many of you, I suppose, I have struggled to set boundaries. And I have learned that I should not set a boundary unless I plan to keep it. Scary. Not to mention, just thinking of boundaries means I have to mentally visit all the ugliness of the past and imagine it recurring in the future (so I can figure out the boundaries I need to define). OK, enough whining. How have you set boundaries for your child? I am thinking I need to define them in these categories:

• in the event he relapses (don't call me until you are sober and are back in a recovery program, working with your counselor or sponsor)
• in the event he finds himself in jail (don't call me for bail or to ask me to solve your legal troubles; you need to solve them yourself)
• in the event he wants/needs money (do not call and ask for money. Pay your own bills, we are done. ) - not sure about medical as they relate to his recovery??
• After rehab (you cannot live with us; do not ask to come home)
• School (do not ask us to support you returning to school until you have been sober and in recovery for one year and have demonstrated that you can hold a job, and support yourself. )
• If you have other serious problems (do not expect us to solve it for you; we will be supportive as a Mom and Dad, but you need to solve your own problems)