Hero Experience gain

I'm planning on making an RPG map, and have have the next problem:

How can I control the exp. gain? I mean, my heroes will become a high lvl (max 50), and I don't know how many exp. you need to level up if you are for example 34...
Second, where can I set how many exp a unit gives me if it dies (different for each TYPE of unit)?

Does this all needs to be triggered, or do you know what values are used?

Thanks for any helpfull reply!

100% is default, i think all units give the same exp or exp is determined by level of unit,( i think its a level based mutiplier) and you can change that in gameplay constants but im not sure, in order to give units bonus exp for kills you can just do like

Everything about experience is controlled in gameplay constants.
Though its kinda hard to set up exact numbers for experience you want to have, it is still possible to have meaningful experience gathering patterns.