I would always buy good quality paints and papers , they are expensive but you will learn with them and it is much fun to use , bad quality things are not very useful .
you need a set of watercolor :
I recommend pan ones because you don't need palette ,
http://www.google.com/products/catalog?hl=en&biw=1280&bih=697&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&q=watercolor+set&um=1&ie=UTF-8&tbm=shop&cid=18343376688266007804&sa=X&ei=cJtST__VE8_sObPT9ZIK&ved=0CHcQ8wIwAA
and if you paint professionally , you will need at least 6 good quality and different sizes of brushes . but for beginners I would recommend :
http://www.dickblick.com/items/05802-3110/?wmcp=google&wmcid=items&wmckw=05802-3110
get a round brush , size 10 is good for you .
and paper :
http://www.misterart.com/paper-boards/art-illustration/watercolor-paper/strathmore-300-series-watercolor-paper.html?utm_source=google&utm_medium=datafeed&utm_term=25420&utm_campaign=GoogleProducts
those stuff are not good for an artist , but they are great for starters ..
good luck and have fun :)))