[@Eklispe] The way I read it is that you cannot spend 4 points on any one skill (or 2 if it's a non-class skill), not that you can only spend points on 4 skills. 

So, for example you can put 4 points in Diplomacy, placing you at rank 4. Since it's a class skill for Warders, that's OK. However, Balance isn't a class skill for Warders, so you can only increase it to rank 2 at level 1.