I hope you had a good break and are ready to get Thesis B started. Please send an email to your supervisor to find a regular meeting time (if you haven't done that yet) so that you can resume your Thesis work.
There is only one deliverable for Thesis B: demo in week 11. Some useful resources at the Thesis B website are: marking criteria for Thesis B demo, sample Thesis B demo slides, etc.
Time management is an important element to succeed for Thesis B. You should make sure that you devote time each week to work on your project. The progress that you make each week will ensure that you have something substantial to demonstrate at the end of the term.
As I mentioned in my "Introduction to Thesis" talk for Thesis A, a constructive recipe for your weekly meeting with your supervisor is to discuss the following:
These questions will help you to reflect on your work and progress.
All the best for your Thesis B!