Looking for a resource or if you can help me with type of retainer agreement best for following type of cases:

Family Law (simple divorce, adoption)

Personal injury (where client has no money but has good case)

Corporate law (company needs regular, substantial legal services)

Criminal law (driving-under-the-influence case)

A case involving major litigation on which attorneys with difference degrees of experience will be working

I do not know that there are different retainer agreements?