Hull Repair question

Hi,
I'm pretty excited, I just acquired a DS II, which is the same on I used sail with my friend, when he bought it new. Problem is: On the Port side, about where the trailer support contacts the hull, it is caved in a bit. It sat outside on the ground for quite a few years. It would appear I need to "pop" the hull out, but need to figure out how to make it stay that way. There are also two punctures in the Port side of the hull, which don't appear to be a difficult fix. Any suggestions on where to start with my "cave in" problem?
Thanks. Pat H
I'm pretty excited, I just acquired a DS II, which is the same on I used sail with my friend, when he bought it new. Problem is: On the Port side, about where the trailer support contacts the hull, it is caved in a bit. It sat outside on the ground for quite a few years. It would appear I need to "pop" the hull out, but need to figure out how to make it stay that way. There are also two punctures in the Port side of the hull, which don't appear to be a difficult fix. Any suggestions on where to start with my "cave in" problem?
Thanks. Pat H