Honestly, the basic idea of Leia creating the First Order as something to unite against is good, I just wouldn’t have her stay in charge of them. She gets in over her head hiring local warlords and imperial remnants to unite and when Snoke comes along with a new vision for them she realizes how badly she fucked up.
Yeah, that could actually be a nice way to give a tragic note to Leia’s character. I’d imagine something like this:
After the end of the war, Leia was disappointed at the new government’s pacifist direction. She created the First Order to keep the Republic united against a common enemy, but when Snoke rose to power, she realized that she had accidentally created a new Empire. When the Senate found out, she became an exile from the government. She tried to make amends by creating the Resistance, but deep down she’s still ashamed of indirectly turning her son to the dark side.
This would probably fit better in the rewrite thread though.