Most injuries that I read about on this site are virtually impossible to diagnose because I can't see the person. So, it is pretty tough to give advice on rehab. This is one where I feel comfortable in lending my opinion. Remember this is just my opinion and not a substitute for actually seeing a medical practitioner.
There are several degrees of shoulder separation with grade one being the least amount of ligament damage. Some texts will tell you there are three different grades (I,II, & III) while others go up to VII grades. Grade I is painful, but structurally not horrible unless you push it too much and increase the amount of tearing. At this point you have to let pain be your guide. If it hurts, back off.
I have separated my shoulder twice while lifting. Both times it took months to get to the point where I could go heavy again. If you have to start benching with 5lb dumbbells, then that's what you have to do. Remember there is a fine line between tough and stupid.
As far as treatment goes, you could see a PT for exercises, but there is probably little he/she will do that will accelerate the healing process. They may be able to alleviate some pain for the short term with ultrasound or e-stim, but ice massage at home will be just as effective in this case. Take a styrofoam cup and fill it with water then put it in the freezer. When it is frozen, peel off the lip of the cup to expose the ice and rub it on your skin around the injured area. You can also use an ice cube, but I don't think it is as convenient. Make sure to cover a rather large area on the shoulder (about the size of a baseball) don't just focus on the AC joint or you may frostbite your skin.
When the skin is numb to the touch, you are done. Usually 5-7 minutes, never go longer than 10 minutes. You can do this as many times a day as you can fit it in. I would suggest at least 4. Before work, after work, after dinner and before you go to bed are times when you will generally have a few minutes to spare. If you have any sort of bad reaction to the ice (some are actually "allergic" to the cold but that is another topic) stop immediately.
The exercises that will place extra stress on muscles attached to the clavicle are the ones that will probably be the most painful i.e. bench press, pushups, overhead presses, etc. Once again, let pain be your guide.
Unfortunately you have to be patient when you are injured. If you aren't getting ready for a competition of some sort then there should be no sense of urgency. It is just a speedbump in your training life. Try not to get too frustrated. Hope this helps.