True rebuilds are a big commitment, it can be accelerated with cash, though.
What do you think your emphasis is going to be? Are you going to train from scratch, or pick up a young, but developed and trainable core, and go from there? The journey of the rebuild can be quite fun. When I played BB with my first squad, I started in Season 8 and eventually promoted a couple of times and spent some competitive seasons in Div III. When I opted for a true rebuild, I signed my own death warrant, lol. I dropped into a really good Div IV, combined with a real-life career change, and dropped BB altogether. You'll probably do a great job, however.
This time around I have managed to keep two of my core players from day one, Rucker and Muller. It's been kinda fun to watch them develop over the past year.