Truck driver taxes

Hello. My husband is a truck driver. His employer will pay him with 1099. My husband was advised to register an LLC and have EIN for tax purposes. Do I need to register a separate Turbo account for him? So far I’ve always filed jointly but I only had my income on W2. As of July onwards there will be 2 incomes - mine and my husband’s. How do I combine the two? Also, I read my husband should file quarterly and pay estimated taxes. I don’t know how to handle this... Thank you in advance.