Can anyone reccommend a good introduction to Bhuddism?

I really need to sort my life out. I've tried therapy, drugs, both legal and not, alcohol you name it, none of these work for me. I really want to turn my life around and get rid of all the negativity and just... be happy! I know very little about bhuddism and have always been dubious about "alternative" approaches but I'm now open to explore different options. All I know about it it's that it teaches you to lead your life in a positive way so that positive things will come your way... Is that true? Is there anything I can read about it as an introduction, a Bhuddist guide to beginners if you want? thanx for all your suggestions!