Procedure in St. Louis.
Once you send your Packet III to St. Louis, (p3 should only contain DS-230 part I and cashier check payable to the department of state), St. Louis will process the information and forward to the consulate which in term will give you an interview date. They will send you P4 containing a list of doctors in NWD and also directions to get to the consulate, a new form DS-230 in case some info have changed since you applied and finally the forms IRS-9003 for tax purposes.