I have 2 status automations I am trying to piece together: 

Quick Background. Our lead funnel is as follows: 
1. Acquired
2. In Email Drip 
3. Contacted (those who have responded to email drip) 
4. Cold (those who made it through the X day drip in #2) 
5. Pitched

A. How can we automatically move leads from stage 2 to stage 3 when they reply 
B. How can we automatically move leads from stage 2 to 4 when they do not reply after 40 days.

Each opportunity requires weekly actions from our account management team. 

How do I create the following recurring task: [note - can you even create tasks around a certain opportunity?]

Creation Trigger: Task created when Opportunity created
Assigned to: Opportunity Owner
Due Date: 1 week after opened
Recurrence Interval: Each week (Each Saturday)
Lifespan: until Opportunity is closed

Description: each opportunity has a weekly task that the owner must complete.