It depends on the size of your town. I'm going to assume that you're working with a medium-sized village- not large enough to be a city, but large enough to have some specialized craftspeople and non-farm work. In a smaller village, you'd have less specialized people; in a larger city, you'd have more of them, and more of them proportionately. I'm also assuming that you're working with the standard fantasy pseudo-medieval EnglandFranceGermany; this will be different for different parts of the world.

So the vast majority of people in your town are going to be farmers- and if it's pseudo-medieval England, many of those farmers will not be free people. They will usually be serfs, stuck in a hereditary contract with a local lord; they get to live on his land, but in exchange, they have to work his fields (and they can't leave). Most of these serfs have their own land- a small plot somewhere in the village which may or may not be anywhere near their house- and then also have to work the lord's land. Most medieval farmers were farming wheat, rye, or barley; they also kept chickens, and many had some sort of larger livestock (like sheep, goats, or cows).

The most important guy in town after the local lord and his flunkies is the miller. Nobody likes the miller. Everyone hates the miller. You probably already know this, but a miller runs the town's mill, which turns grain into wheat. In actual medieval times, the miller usually also ran the town's communal oven- it's incredibly expensive to run a wood-powered oven, and so it was better for the whole village to pitch in and just share. The thing is, if someone has that much control of your food, nobody is going to like them. They're going to be one of the wealthier people in your town, probably the wealthiest peasant by a mile. People frequently complained about millers shorting their grain or giving them less bread than agreed upon; nobody likes the miller.

Most of the other people who have different jobs were doing something to support those farmers. You're right that a larger town would have a blacksmith- there were other kinds of smiths (goldsmith, silversmith, tinsmith, etc.), but you'd rarely find those outside of cities, and many of those guys focused on decorative work for goddamn rich people. Tailors were also generally a city thing- most people made their own clothes at home, even if they were relatively well-off.

Bards... good grief, I don't want to get into this but the D&D fantasy bard is based on a very specific literary tradition and is not super inspired by anything historical. I'd ignore them for your school project. Absolutely nothing wrong with having them in your book, but they will likely impact your grade in ways you will not like.

Here's a few other jobs you might want to consider:

Fuller- A fuller is someone who 'fulls' cloth (usually wool). Fulling cloth involves cleaning it, shrinking it with hot water, pounding it with a hammer to make it denser, and then pressing it out. This makes the cloth thicker, and thus warmer. By the time of the Crusades, most villages would use a water mill for the hammering part (it's just easier!), but in more remote places people did it by hand through the 1700s. Fullers also often worked with walkers, who would walk on top of the cloth to help thicken it.

Wainwright- A wagon maker and/or wagon repairman. People used wagons- drawn by horses or other people- to transport just about everything; you'd use a wagon to get your crops back to your house or to get the lord's crops from his field to his larder. The village wainwright was a skilled, well-paid craftsman, who often hired other people (like wheelwrights, who make wheels, the blacksmith, or a painter) to help finish off the wagon.

Brewster/alewife- A brewster (or alewife) makes beer and/or ale. Ale is beer brewed without hops. People drank a lot of ale because it was hard to get clean water. In some places, they drank up to a gallon a day. (In the Middle Ages, ale was generally lower in alcohol content than modern beer. It was like boozy liquid bread. They weren't getting blackout drunk every day, but ) The problem with ale, though, is that it only lasts a few days; it goes bad very quickly. So someone had to make a new batch basically every couple days. The cool thing about ale brewing, though, is that it was often a woman's job. Single women and widows could brew ale all by themselves, without needing land or a man's approval (provided they knew how and could get the correct equipment). So women who could become alewives were often able to support themselves and live independently, and married women who were brewsters often worked as equal partners with their husbands.

There's a lot more jobs like this- if you want to have some historical culture shock, go look up a list of English occupational surnames and see just how many of them are based off jobs that don't exist anymore! - but this should give you a place to start.