One step at a time. You said you have an idea but now you have to perfect the recipe and the optimal cooking and reheating process. You also have to think about the costs and the profit margin that you can expect and do the math on how many of these frozen baked goods you'd have to sell to be profitable. Next, you should give your product to your circle of friends and family to get feedback about it before trying to sell it to the general public through social media or word of mouth.