Making magic consistent with the laws of physics is hard, it is much simpler to create new laws that are encompassing and have drawbacks as high as the rewards, but with characters willing to endure the drawbacks.
first, lets take a person with super strength, he may have more muscles than anyone else but he would need to eat more or his bones would be the same as our own and therefore each time he used his strength even for a short time, he risks breaking his own bones and being massively fatigued. This is not "magic" but this is a simple example.
There are books that follow this logic, one of those is "The Black Company" by Glen Cook. The setting is low fantasy and early on the setting is that doing magic is simply expending your bodies calories to do things instantly rather than doing them by hand. For this reason most of the magic done are small things, parlor tricks like illusions and false sounds because those are cheaper than say throwing a ball of fire.
There are also other approaches like adding physics to the magic. The lightbringer novels by Brent Weeks is a good example of this. He places hard restrictions on magic; how to get it, values such as mass and tinsel strength, and even mental tolls. Using magic in his world even alters your body by forcing the magic from your body you cut open your skin and slowly change the colors in your body.
You can even look to dungeons and dragons in adding laws to your magic, such as requiring ingredients to cheapen the cost physically but to limit what can be done and increasing fiscal cost. There is also preparation time to make the sorcerer think twice as their target may kill them before the magic even completes.
Your magic is almost a character itself, there must be consequences for just willing things into place unlike Harry Potter. Whatever you decide, make sure the approach is consistent as a reader can easily tell if your breaking your own rules to advance the plot.