Enchanting/Buffing skills with elements

Hi,

So I'm scratching my head, trying to figure out how do I add an elemental +% damage to my skill attack with a help of a state. What I mean is, I don't want to say... "buff" the % of a fire skill, more like enchant a weapon with fire so instead of pure physical attacks, it also does fire damage from now on. I have Yanfly's element core but I have no idea if it's even possible with that plugin, at least I can't find an option to do that.

Secondly (this is rather minor, I can live without it), I was wondering if there is a way to alter the attack animation as soon as the weapon is buffed, giving it some fire related sparks or whatnot.

Thanks in advance.