Will you be at the AGM as I can bring along a book that you can have (if I can find it)?
https://tinyurl.com/ybms4428I would suggest just getting out there to do an outdoor 20 min FTP test, at least this will give you your first numbers.
A Fitbit Charge 2 would also be a good tool, linking your Fitbit account to Strava and cronometer would allow you to monitor your calories in vs calories out... keep an eye on the Carbs, Fat and Protein and just start touching on a calories deficit will start to allow the weight loss.
Once you've got your FTP just go out and ride, get used to the data that's being displayed for a few weeks and then look at building on some smaller intervals (40/20s etc) and go from there.
If you get that going over the next 2/3 months then that should start you down the right track for training to power for the start of spring.