What do I need to do to start my car?

What is your question?

My jeep will not start! The radio turns on and the power locks work. But I can not use the hazards or turn on any lights. When I turn rhe key, the gauges fo crazy and I hear a little click but nothing else. I let it sit overnight and nothing. I just got it jumped yesterday and the guy told me the negative was loose. How do I fix it. Should I get another battery altogether. Also what type of jump starter should I buy for this vehicle