[THEBERBSTER]

Hi m-p
The Total Germany default boat is the type VIIA although TWoS does give you the option to start the Campaign with the VIIB which can be enabled through JSGME.

In this campaign you upgrade from VIIA to VIIB as you continue to progress your career.
You can check here to see what boats are in which Campaigns.
Open Horizons II > Campaign Dates > Bases > U-Boats > An Essential Guide

Your Renown is spent on equipment as it becomes available.
Peter