well it depends on what plans you have for the future. If later on you want to establish a designing company then its better that you give your business a corporate image at the start so that people assume that you are a professional company and not just any free lancer.
On the other hand if you want to carry that on your own then you brand it with your own name so that your people recognize your work by your own name.
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Pricing depends on various factors as discussed above. It is your calculation that counts more rather than the size of the company. It doesn't matter if your client has a small business or large.
Since you have worked with a company I would advise you to draft 2-3 packages for yourself. Place rough estimates like package A, package B and package C based on orders. Now every time an order comes in you can weight that against your already calculated estimates and place it in a particular category. Then you can do the calculation in accordance with your order. This will save your time and you will also have a reasonable justification for charging these prices.
