Took a jumper wire and tried to jump it across from positive side to negative and it smoked and now it will not start

So I just bought the van. seemed like a good buy until i got home and realized the fans wasn't working and saw that it was overheating after I got home after a two hour drive. so I found the fan relay switch and I took a jumper wire and tried to jump it across from positive side to negative and it smoked and now it wont start. can and would you help me please? the only thing it does is click and acts like the battery is dead or has a loose connection. but the battery is good and tight and didn't bother with the battery.