Too much oil

My car is a 2000 Dodge Caravan. It is automatic and has about 60,000 miles. It is a 4 wheel drive vehicle. It recently was having problems, and I didn't know what was wrong. I don't have a lot of car experience, so I didn't do much. I found out it was low on oil. I was going to buy a couple of quarts, try that, and then buy more if needed. My husband said no, buy a large bottle, so I did. He wasn't home and I was having problems, so I added oil. All of it. Then, I started the car. I went inside to get the kids ready for school, and came out to white smoke with oil blown out of the exhaust pipe.
I'd like to know a diagnosis, and if its an expensive problem to fix.
I haven't driven the vehicle since this happened.
HELP! I'm going crazy without a vehicle, and my husband isn't being very helpful. (Never home during the day time and insists that he doesn't know anything about cars).
I live in a small town, so I would like to have an idea of what to expect before I go for help, because I've heard many of the mechanics here look for anything and everything they can charge you for - especially if I show up without my husband.
Thanks for your help in advance,
tlboyds