Here is my $1.00's worth. Take everything in little steps. Try the same thing over and over and over. Practice the one leg starts, practice if your foot comes out when you start, practice slow and emergency stops. Only add speed in small doses. When you are having problems...coast. I started as a 60 yo and gained a lot of upper body strength and balance in the process. Try to leave more room around common road bikes as they will assume you are as maneuverable as they are, we are not and our turning circle and balance at slow speed stinks (on average) compared to an upright road bike. Also we generally start slower. These reasons are why I ride a short distance off the back of a group of upright road bikes. You have to be careful at the lights as you will sometimes be cutoff as the yellow turns red. Because I have a higher top speed it is usually not hard to catch the group. Be patient and careful. Always ride with bright day and non-glaring night flashing and solid lights. No sudden motions, ever. Get a 1 - Garmin Varia and 2 - a mirror, and 3 - briefly glance over shoulder when changing lanes (3 layers of protection). Assume you are invisible to cars and trucks, really. I wave traffic on that has stopped in a dangerous fashion all the time, people will do crazy things around bikes. When in doubt just wait, safety trumps everything else.
Also, if you should fall know that you are not very high up. The best approach is to let the bike slam down as you climb upward on the handlebars (like the Titanic sinking). That sums up my only three V20 falls and the only things that suffered were my right shoe that got ground down, my derailleur which got ground down but still worked, and my right handlebar grips were ground a bit. Let the bike take the hit. Let the bike slide on the pavement and get eaten up. Strangely I only fall to the right side, even on upright bikes.