yet another tax question that probably has been asked many times

[dafulv]

I apologize to anyone who has seen this posted before (as i am sure it has) and I thank in advance anyone who answers. If I made 5k this year playing and have a paper trail of 3k in checks, must I pay taxes on it? And about how much is it looking like I should pay? And what are the consequences of not paying it and the likelihood of getting in trouble?