The only downside to a home with an acre lot is that it is very isolated. You might be safer in the beginning with neighbors close by. Not that you would have to stay there (or anywhere) forever, but having help close by can be a godsend if he were to show up at your door (which can happen even if you have a PFA).
Your instincts are right on about the wisdom of joint therapy. Abusers are very good at manipulating therapy sessions, as well as likely to use anything you say in therapy against you later. It can become yet another platform for him to control you. Of course, when you decline you will be accused of "not caring about the marriage." That's where you practice detachment and simply say you are not ready RIGHT NOW to do that. Again--you don't need to signal that you have one foot out the door.