Fireproof everything.
On a serious note, it depends on how old the torchic is. In general, the older the fire-type starter, the more likely they’ll know how to control their abilities, so although it’s wise to fireproof your torchic’s space (that is, remove any flammable materials from wherever it will spend the most time, invest in another fire alarm and a fire extinguisher if possible, consider catching a water-type, and so forth), it’s not completely necessary to go out of your way to do so.
Beyond that, the most important things to remember is that your torchic is a bird and a fire-type. Torchic thrive better in open spaces, rather than coops or cages (contrary to popular belief), but a coop is important to have as a form of shelter for the rain. You could also keep your torchic inside your house, but if so, be aware that torchic are harder to housebreak than any other fire-type. In other words, it’s honestly better to keep your torchic in your yard, just because of the flaming poop alone. If keeping your torchic indoors, provide for it a “litter box” with bedding and train the torchic to stay within reach of it. Also, remember to douse any accidents with water before cleaning it up. Even if not actively on fire, torchic excrement can still be smoldering and too hot to touch. If keeping an outdoor torchic, be sure to clean its coop as often as possible and keep a water-type outside to take care of any accidents on dry grass.
Also, provide your torchic with a sand bath, not a water bath. Sand baths will help your torchic stay clean and keep off parasites, whereas water baths will just irritate its skin and lead to a drop in body temperature.
Speaking of which, while older torchic, as well as combusken and blaziken, will have stable body temperatures, younger torchic need a heat source to stay warm. Even then, until evolution, it’s generally a good idea to keep your torchic as warm as possible, especially in the winter months. Indoor torchic can be kept warm with any ordinary electric heater, but pokémarts also sell special heaters for torchic coops.
The coop itself should be large enough to house a blaziken, have a roof, and be lined with mesh, not only to avoid burning but also to discourage predators from getting at your torchic or scavengers from getting at its droppings and food. The mesh should allow breezes to enter the coop to maintain your torchic’s respiratory health, but the roof needs to be large enough to keep the rain off. It’s fine if you need to sacrifice some wall space to minimize flooding inside the coop, but vents or windows are absolutely necessary. Remember to put in a shelf for your torchic and its evolutions to sleep on and provide nesting materials (hay, for example—and, yes, it’s fine if it burns, so long as you’re fine with replacing it). Finally, your torchic’s food and water dishes can be placed inside the coop—or by its litter box, if it’s an indoor torchic.
As for food, torchic typically eat vegetables, fruits, and grains, and they can be given leafy greens, whole beans, shelled sunflower seeds, corn, and flowers. However, they’re not exclusively herbivores, and they can be given meal worms and finely crushed oyster shells as well. (Shells are a great source of calcium, which female torchic may need for egg-laying.) Additionally, be sure to give your torchic grit (also available in pokémarts—it will be marketed as “bird pokémon grit”), as torchic’s lack of teeth mean it needs something in its gizzard to grind its food and aid in digestion.
Finally, as the precursor to a fighting-type line, it’s important to establish a training routine early on. Having your torchic go for a run or practice kicking on a training dummy will do wonders to develop the kicking abilities its evolved forms are known for. Otherwise, the standard hour of training and battling for any new addition to your team is highly recommended. Just note that, as a newly traded pokémon, your torchic will be far more eager to please and bond with you than a pokémon you’ve caught yourself (this is normal behavior—and, in fact, a good sign that your torchic doesn’t think it’s been abandoned by its former trainer but rather sees you as a stranger to befriend), so it may be quicker to learn and grow than other pokémon you may have handled. Keep an eye on it and remember to step in if it looks like your torchic is going overboard.
In other words, many of the things you may have done for your normal-type pokémon (especially if those normal-types were also birds) can apply to your torchic; it’s just that you may need to take extra caution when it comes to cleaning up after it.
Good luck, anonymous, and congratulations on your new torchic!
The Pokédex According to Bill 