Earlier quoted context omitted.
Plus one in health and physical fitness. Buying a bicycle and using it daily was probably the best investment I ever made in myself. Also, I can't believe that I smoked those filthy cigarretes for so long, but how good is that I stopped this habit. About material realizations please remind that the average successful enterpreneur age is about 45. I only started being able to save serious, retirement-style money when…
Which bike did you buy?
Install all safety systems: front and rear bike lights, mirror, reflectors, use helmet, reflectors, wear reflective jacket, etc. You must be visible at the road at all times. (I use no helmet, because I'm trained to fall properly, but I recommend to wear helmet until you fall at least 10 times.)
Ensure that your legs are working for the full length, by raising the seat as much as you can, to avoid problems with joints. I'm raising my seat so much, that it feels like running, because I press pedal with toe instead of whole foot. Otherwise, you will have powerful legs, but weak foots, so you can break your heel just by running. (I did).
If you ride in winter conditions, lower the bike seat until you can reach the ground with the tips of your shoes instead, so you can reach the ground quickly when the road is slippery.
Bike will make your legs strong and healthy, but your upper body will require additional training. AFAIK, the best way to keep the whole body in good condition is to combine biking with swimming or sport dancing. (I use biking + ballroom dancing). Ballroom dancing also improves situation awareness a lot: I never had a collision with somebody else after few years of ballroom dancing.