Approval Request for hardware and software

I am looking to create an automated approval request process for our company’s hardware and software. If someone on staff has a request they fill out a form and it then automatically sends to the department supervisor for approval, then to the department head, and then if it is over $500 it gets sent to the CFO for approval. Once all approvals are accepted it gets sent to the purchasing manager for purchase.
Does anyone have an app I can copy and modify? If not, any suggestions on a good place to start?

Create a workflow which triggers when a record is created

Add this person to the above workflow too

Create a seperate workflow for this, also on creation of a record, and with the condition [Amount]>=500

Use Before and After Values | AppSheet Help Center to create a 3rd work flow for this condition