Does the doctor have to give you a prescription strength? He did not for us. Now we have to contact this doctor on Monday to get a strength. Please help.

It is actually a part of the prescription as to what you are eligible to get.

Once you get the card you pick up whatever you want the cashier/budtender will help you out with picking which is best for your problem the Dr is not involved in the process

No you don't get a specific strength you get so many mg of inhalation and or flower

Mostly depends on and what you need it for.