Can someone help? 

I have equipment that is too powerful for my hero.  It says I need to gain more experience points and level up to use it.   where do I see what my experience points are and do I need to attack castle and bg more to gain these points?

I am considering buying Hero Pack but trying to get more information from all you elite player who would be able to provide me with better advise on type of Hero Pack to buy. Class III or Class IV.  Uncommon to Mythical.

I am a bit concern that most likely I will not be able to equip those equipment.  Then it would be a waste of sapphire.

My other question: Is Class I mythical equipment stats higher than Class IV uncommon stats for infantry?  I am trying to see if there is a huge difference for the infantry stats