Abilities scaling and descriptions

There is two questions:

1. How exactly ability scaling works? If i do 500 damage with ability which have base damage of 100, and then level it up to base damage 110 would it do 510, or more because additional damage from stats also would be amplified? 2. Is there any resource which have full abilities description? Some skills just seem to miss on a lot of stuff. For example "Fire pillar" should do exactly same stuff as "Flaming ground" if you just read description (which would make no sense); however, it applies stacking debuff which simply reads "Dealing continuous fire damage" which does not help a lot.