How did you level in other TES games?
In Morrowind and Oblivon...
On character creation, you picked a "class" of thief, mage, warrior. This gave that skill set a +skill bonus to start.
You then picked major skills. These start out higher level also.
When you gained 10 skill increases in your major skills, you gained a level.
The class and major skills also leveled faster than minor out of class skills.
Now when you leveled up, you could pick 3 attributes to increase. You could have up to a +5 bonus in the selected attribues. The actual bonus though depended on which skills increased for that level. Each skill was tied to an attribute.
So in order to get the max bonus, you had to keep track of what all skill increased, and figure out what skill you had to grind to get that +5 in the attribte you want.