eerr's response touched a nerve, so I'm going to move from my forum troll form to my snooty know-it-all businessman form. Time for a lengthy rant.
If you're going to start a bakery in less than $60 (not including loans), forget it. I'll bet that it'll never get anywhere. If it lasts more than 10 years, I'll personally buy $120 of your bread.
I've got a bit of experience trying to start off a business from scratch. Got to the point of having a 'service' business that would rake in $3M in revenue after 5 years. The big problem was that with the amount of effort it takes, I could start a much more profitable business in another field. That's right, you can make millions off a small business, but you need to take risks.
First, don't be scared to start big. Statistics show that most business that start huge (100+ people) don't fail, and that you're most likely to fail by starting small. I could dig up those statistics, but too lazy.
This is for a good reason. Because people don't bother to take it seriously. Money needs hard work. If you're not willing to work very hard, you're going to fail. There's a lot of people with this retarded idea that they don't have to advertise, they don't have to hunt for customers, they don't even need an office or store or to pay for the tools they're using. And I meet these same people whining later that customers won't go to them, and that people don't want to review or look at their product.
That is to say, You can run this as a side venture without any worries. Just sell some bread online for now.
I'm sure if it's big enough, someone will eventually accost you and tell you that you need to do X, but you aren't sigificant and can get away with this.
Treat this as personal small buisness income if you do pay taxes. I am very certain you won't need to change this unless you start hiring people and become a real bakery.
While eerr's advice was well intended, this is the biggest newbie mistake small businesses make. If you start it as a side venture, you'll make pennies, and it'll be out of sympathy. If you really want a side venture, start a lemonade stand (or bread stand). Don't do it on the internet. The dot-com bubble burst a long time ago. People don't even look for bread on eBay, they won't look for it from your website.
If you want to make money, you have to spend money. This is the point where most noobs whine, "But I'm not a rich bread tycoon, I'm just a kid". No. Everyone's business starts from the 3F's - friends, family, and fools. Convince your 3F's to give you the money to start. If you can't convince yourself to ask them for money, then what makes you think that it's not a waste of time? If you can't convince them to give you money, then find ways of making yourself more convincing. This is where your business plan comes in. This is why you have to write a business plan, to convince both yourself and your investors.
If all your 3F's are dirt poor, then check around your country for SME loans. They give far more generous rates than banks, and if your country is supporting enough of SMEs, you won't even have to pay it all back. Then go to banks. And if it's still not enough, investors. Don't go to loan sharks. If you can't get enough money before loan sharks, you'll never make enough money to not get a leg cut off.
Food is a very recession proof business. People will cut down on buying apartments, cars, TVs, etc, but everyone needs bread. Government might inject money into businesses. Fairly skilled people will be desperate for a job.
Next, find all the regulations that apply, which I assume you have by now. Follow all of them. You don't want to be fined or anything. The fine itself won't hurt so much, but reputation takes time to earn and you need as much as you can get. Reputation is what brings in customers and it's what keeps them, even if your products stop being as good.
Find out how much you need to spend. Write it down. WRITE IT. It looks good on the business plan when you know how much you're going to spend and how much you expect to learn. Go and scout every equipment and place and people you need to pay for.
Don't spend too long on market research. The business plan is obsolete at the printer, or even long before that. What many business schools don't teach is that you'll never get everything. You're going to make a lot of estimates - just make sure you're being as realistic and objective as you can. With anything as risky and big as this, you want to know where you're going.
If you don't have time, don't start. It'll be very stressful. It looks good on college application, though, and it is possible to pull it off. In the civilized world where they don't have child labor laws, teenagers run food stalls all the time.
But don't just mope around. Spend your free time planning out the whole thing. A good business plan really helps. At the very least, it'll comfort you. You seem very nervous about doing this, and having a good business plan will clear that. Also contrary to what they may teach you in some places, business plans should be as short as possible, so keep it simple.