Heather you have been so brave speaking your heart out here today. I know some people can come accross as harsh, but they are all genuine. I know it's hard to learn to parent these days, when we were younger many things were accepted as normal, I myself at age 9 had to look after my 2 year old sister, it was a lot of responsibility, too much for a 9 year old.
Take the useful advice and try to work it in. To have calm, happy children takes a lot of hard work, especially with the age ranges you are managing on your own. Hats off to you for seeking advice when you know you are struggling on your own.
I am really sad to hear you have done this so long on your own, I bet before that it wasn't exactly a party either, but you are doing it, so well done, and keep on trying. We are all learning, and there is tons of advice out there, good advice.
Really hope you have found some good ideas here today, structure really is the key, it's a lot of hard work, but you find things that work, and then you start rotating activities that work, and it starts feeling easier.
Well done for putting your neck on the line, I really hope you have ended the day feeling more hopeful than you started.