Damn, dude, you sound like a mess! Ha!! Just kidding. Especially when you're just starting out EVERYTHING hurts. Seriously.

Your wrists: 1st off, I have thin, girly hands & wrists, too. Ha!! That isn't the problem. The pain can be coming from a number of things. If you aren't accustomed to hitting things, you are probably causing minute hairline fractures in the bones of your hands and wrists. These are actually a good thing. They will heal, and your bones will be harder and more durable. This process however is EXTREMELY painful. I believe it happens to a lot of people. Don't worry...this will get better. To combat this: ice your hands after you work out. This is very important, so don't overlook it. In the long run, you will feel better if you do this dilligently after every workour. Also: make sure you're wearing good gloves. Gloves can be expensive, but that is one thing that you can't be cheap about. Protect your hands! Buy Everlast or another reputable brand of glove. Also, instead of little 8oz. bag-gloves, wear 12-16oz. training gloves. The extra padding in addition to properly wrapping your hands will save you a lot of pain.

Improper form: The pain (especially in your wrists) could be caused by improper form. Make sure your wrist is aligned with your arm and that you are making a complete fist when you punch.  

Exercises: Unfortunately, i don't know any. I've been asking for recommendations, as well. (like i said, I too have dainty lil hands/wrists) You could buy some of those grip strengtheners, as I believe that utilizes wrist muscles, as well. I know I've seen wrist-stengthening contraptions in Everlast/Title catalogues, but can't attest to their worth. Sorry...

Evergel: I hate em. They give me blisters on the insides of my knuckles. Once, after a two hour training session, they had rubbed most of the skin off my knuckles. Some people swear by them. I don't. I would say that wraps offer much more protection.

Good luck with your pains, I know that can be a huge factor in making a person quit. I hope you can tough it out. You'll be a better man because of it.

Take care!!