If you want to take the business seriously I would just open an LLC and set the business type to "Privately-owned business", you are going to have a lot more options on Amazon and it's going to be a lot easier to get the first sales.
You can offer prime shipping and create PPC campaigns, you are also not limited to selling only 40 units per month.
In the beginning I was like you, I didn't want to take big risks and tried selling with individual account, I didn't get any sales and then I just took the courage and opened a business account.
I have a good product now and selling well and I had other not so good products that didn't make much profits.
Just do a good product research and go for it, even if you break even you will learn a ton and you will know what to do and what not to do in the future.
Btw, you can open an individual account already, and then switch that to a business account when you are ready.
You can offer prime shipping and create PPC campaigns, you are also not limited to selling only 40 units per month.
In the beginning I was like you, I didn't want to take big risks and tried selling with individual account, I didn't get any sales and then I just took the courage and opened a business account.
I have a good product now and selling well and I had other not so good products that didn't make much profits.
Just do a good product research and go for it, even if you break even you will learn a ton and you will know what to do and what not to do in the future.
Btw, you can open an individual account already, and then switch that to a business account when you are ready.