Just started playing and found out i only got few hero

To earn the money so hard and each hero cost 30k

How the heck do i unlock new hero?

this is what i do. U get money by playing good. U just play good until u reach end of the season. They will give u like 30k when u reach epic.

I am playing as mm mid and i build my heroes on attack speed. Make sure to upgrade your emblem also. Easiest hero is layla.