Mi problem is, i need to assign different tasks for different user in different groups, my idea is when i start the flow deploy a list of user for all user in alfresco, that can select 3 users and assign these to different tasks flow along
Take a look at the parallel review/approve processes in Alfresco. This shows how to allow selecting multiple people and create task for earch of them (multi-instance task). Start from that definition and add all the bits you need.