If you take a look at this
http://i46.tinypic.com/2lntqp3.png ,you will see the minimum number that has to be there, you will get 15 SP's to put where you want and if Im not mistaken if there is more in a attribute then min then you can take from that attribute and put in another one,this example shows 12 in throwing, you could take 2 and put it in kicking if you wished. with the slider you will either be adding or taking away points from attribute depending on what you like in the H/Wt.
Someone correct me if Im wrong.