Welcome. I'm a single mother to a DS, 11. I was lucky in that I knew, from the get go, that I would likely be a single parent, and planned life accordingly. My career, in teaching, while not my dream job, is stable, permanent, decently paid and allows me to work around school hours and avoid after-school and holiday care. I would've loved to go to med school (one day, maybe), but this path was the best choice to facilitate a stable and happy home life, with minimal stress.
Home was chosen for it's proximity to work, and the hours give us plenty of time to cook frugal healthy meals, spending around $220/month on food (aust, so prices aren't cheap here either). For the past (and next) 10 yrs, life has been structured around raising a healthy, happy kid. After that, gosh, who knows?
I don't know how helpful that was. My best advice is to work on a strong bond/alliance with the children's other parent. While you may not love them/want to be married to them, having two parents who could harmoniously work together in the kids best interest is a massive advantage, IMO.