I have a major antifreeze leak, I need help?

I have a 93 Buick LeSabre and it has been leaking antifreeze slowly for a little while now. When I went to go to work this morning I noticed a very large puddle of antifreeze on the ground. I took it to work and my temp light went on and I stopped the car and popped the hood to check it out and I couldnt exactly pinpoint the leak but it was steaming off the hot pipes. I dont know what to do, Ive already put alot of money into this car and Im really worried it has something to do with the trans. Please help