Aww poor apple :(

I know it sounds like a horrible place to work, and am glad you are finally making a move to get out of there. But I wouldn't quit without somewhere to go, tbh. Even if you have somewhere to crash, costs start mounting and you'll run out of money pretty quick, and I know your independence is v important to you. I think , grit your teeth, and start investing all your spare time in the evenings looking for a new decent job.

The other thing, is start mending fences with senior personnel before you leave, try and salvage something to get a semi decent reference.

Finally - I think you should talk to HR if you have complaints about way you have been treated, even if you are leaving, you shouldn't go with a stain on your record.

Hope it goes well.