No worries. I'm glad it has motivated you. People whinge about supplements, etc, but there's something to be said for actually getting out, following a plan and getting results.
Max's is actually starting their challenge in Feb next year, so not too long away. If I was you, get comfortable on the Week 1-4 plans. They are quite maintainable, and it's more about breaking bad habits and creating healthy ones. One of my friends did the exact thing last year and lost 20kg in 3 months on just the basic first week plans by being strict with diet and training.
Then when the challenge comes around in a few months, start to tighten things up a bit and push a bit harder in the gym.