2000 Jeep Grand Cherokee wont kick over

I jut baught this jeep off of my friend for and I have done most of the work on it myself so I thought I knew it insode and out. Come to fine out I was wrong I just got back from a 8 hour drive round trip and the jeep maade it fine. But after I got back I went into a place to eat and came out and ended up driving the golf cart back hahaha (good thing I was close).

When I try to start it my lights turn on and all my electrixal works and the first 3 times it wanted to crank but died out but after that everytime I try starting it it makes a really fast clicking sound and leaves off and horrible smell under the hood. Any ideas what that could be?