Its possible you could have separated your shoulder, torn a rotator cuff tendon or another tendon. Your ortho will do x-rays and probably an MRI. He will also test your resistance strength in a variety of positions. If you need surgery, your arm will be immobilized for 6 weeks. You’re not really going to be able to do much of anything in the gym once they put you in a sling. You’re going have trouble just dressing and feeding yourself. PT will be dependent on your insurance but can last anywhere from 6 to 12 weeks.
I’ve had rotator cuff repairs on both shoulders. I’d be careful about making lots of plans until you know the extent of your injury.