Before getting into back something a bit more structured (trainerroad plan with a long rides outside, and a couple of days riding both morning and evening), I quite fancy a 'DIY bootcamp' to help jump-start my fitness a bit..
This sounds akin to all those "training camps" that some cyclists pay a load of money to attend, usually somewhere in a nice climate to facilitate all the planned cycling...
...while there they cycle massively more distance than they're accustomed to, with little to no recovery possible, and then wonder why many of them return home injured
and/or sick
Not a great plan!
Better to contain your new found enthusiasm, IMO, rather than letting it get the better of you, and plan instead for a measured and progressive raising of workload over the medium term. Dull-sounding, perhaps, but likely more effective.