I live abroad and first time filing, I've never earned more than the minimum amount that is to be taxed. And I now own a limited company with my wife. What should I do?

If you have an LLC partnership, you would need to file a 1065 using TurboTax Business which would generate a Schedule K-1 for both you and your wife. You would then report the K-1 on your personal 1040 return which is where it would be taxed at your personal income tax rate.