Now you're able to play the game. You can set up and play in battle with or against other players. You can also use the gold you start with to invest in items, weapons and extra units to add to your army. Generally you should have enough gold to buy and outfit 4 or 5 units depending on what classes you want them to be. Check out the FAQ in the OP as well as the Shop tab of the main spreadsheet. And I'm sure other players would be able to offer advice on making smart purchases.