Congratulations! You survived your divorce. You'll survive single motherhood too. My kids were 15 months and almost 5 when their dad left. We are all thriving now, almost 8 years later.
I am not a woo-woo person, but I found that once the divorce was final and the negative energy drained away, all sorts of things in my life started to fall into place. Good things. This has happened to several o f my friends, too.
Be open to possibilities. New types of jobs. A new living situation. New friends and new experiences. You never know what you might find or how it might change your life.
Know your custody and support agreement inside and out. Set expectations up front that the agreement will be followed and enforced. You can always be more flexible later, after the two of you get used to all of this. Keep meticulous records.
It took me almost a year to adjust to my new household income and budget. My ex had been in charge of all the finances, so I had a pretty steep learning curve. Hopefully you are well ahead of where I was in that you know what you spend and what you have and where you can cut back. Set yourself new goals with what's reasonable for you to achieve with a single income.
I had to learn to ask for help. Most people, when they hear "single mom of a toddler", will bend over backwards to give you a hand. The dad of my daughter's best friend came over to get the Christmas tree down from the attic when I couldn't maneuver it alone. The guy across the street helped me move furniture outside for the garage sale. The mom who heard from the day care workers that I looked like death warmed over that morning volunteered to bring my kids home so I didn't have to get out again. I repaid people with what I could - baked goods, sincere gratitude, and babysitting.
I was able to turn several acquaintances into true friends. We traded childcare in the evenings and had twice-monthly shared dinners (once at my house, once at theirs).
Embrace the parts of shared custody that will make your life easier. The child-free time lets you work more or recharge or, wonder of wonders, go to the grocery store without a small person in tow! (It sucks in the beginning, but you get used to being without your sweetie.)
You really do have a terrific opportunity in front of you, to build the life that suits you now, and not the path that you were on as a couple.