Powerglide burp common problem with the cast iron powerglide. The fluid most likely came from the dipstick tube.Pull the headlight switch and see if you have power to the headlights.If you do clean the starter and solonoid switch and jump the switch from the battery connection to one of the small terminals and see if it turns over. Make sure the transmission is in neutral with the emergency brake on. If it turns over than try it with the key. You may have to remove the starter and bench test it after you clean all the oil from it.