My advice is if this is your first horse please do not attempt the groundwork from videos without some assistance from a experienced horseperson, there are alot of little things that if you do wrong you could put yourself in harms way and also need someone to help to make sure your timing and feel is right to be most effective.
I would suggest obtaining a horse more to your level most likely you will not find one to meet the needs of a first time owner from a rescue..most rescued horses (not all) will have issues, or hiring a trainer to train both you and the horse.
Dickson and Tracy ... Our horses
Dixie (5yr. old QH) Cheyenne (9yr. old Paint) Uno ( 11yr old Arabian)