I have some kids, some of them can use magic, how can they make enough money to live without stealing too much, maybe a bit of pickpocketing. Magic is illegal unless you work directly for a king or a duke, and the kids don't. Tech is medieval.
This is how magic works:
Magic runs in your blood. It is a second life source, and if you run out; you die. The less you have the weaker you get, it is also second stamina. They way your body checks if it is physically strong enough to do something is it checks if your body has enough energy, and magic. The energy gets used up, but the magic doesn’t.
When you actually use magic that is different. When you use magic, you don’t need energy. Magic has two ways of doing something; on release, and on impact. If you were to light a fire, let’s say, and you wanted to do it with magic, you could either send out the magic, still in magic form, and when you hit the pile of sticks, you can turn it into the fire. The other way is to make a small flame that shoots toward the fire and lights in when it hits.
Some spells can be both, but some are only on impact. If you send a spell to paralyze them, make them unable to move, there is no way, unless maybe sending a spray of paralyzing poison toward them, to do it on release.
Also, everyone has magic. Some just produce more than others. This is the reason that few can do great feats of magic, though if they knew how almost anybody could conjure a candle-flame.
Another thing that you had to know about magic is the use of it. Special words, the Olde Tongue, were linked to the usage usually, but not always. The words just helped you to focus and ‘stay on target.’ These words helped magicians to focus on what they were doing and not get lost in the process.
They can't get permanent jobs, people don't want to hire street-rats, and they don't want to get too far on the illegal side, magic is so forbidden that they can't use it for healing and such, the group has about ten members.