We're working on a card library for the web site, aiming to have that ready this month. The silver and gold comes into play when you're playing the full version of the game. They can be spent on vanity/cosmetic items like card sleeves, playmats, foil cards, etc.
Not much we can say about the license front other than maybe
BTW, be sure to join our Discord, we're all active in real-time there: https://discord.gg/rxEA8gA