Most plants are quite happy indoors, provided you can give them the right conditions (although, there are a few that will tolerate dimly-lit rooms and barely any water — here's looking at you ZZ plant and sansevieria). Visit your local nursery for a range of indoor plants.
As a general
rule of thumb, position plants in a well-lit spot, out of direct sunlight, like behind a window with a sheer curtain. Constant direct light, especially from the hot afternoon sun will cause your plants to wilt and suffer. In saying that, each plant will have different light requirements, with a few being able to tolerate low-light rooms, so check the plant label for specifications. Air
Indoor environments can be quite drying for plants, even more so when you have the heater on during winter. For plants that originate in humid climates, like ferns and philodendrons, it's ideal to spritz their leaves regularly with water or consider grouping plants close together to create a micro-climate to help maintain humidity.
Depending on the size of the plant you purchase, you may not need to repot straight away. After a couple of months or when the plant begins to outgrow its container, then you'll need to repot. Ensure you use a good quality potting mix, like Yates Indoor Plants Potting Mix, which is suitable for growing most plants. However, if you have succulents, look for one specially formulated for cacti and succulents, like Yates Thrive Cacti Succulent Potting Mix — the mix is much more free draining.
Plants can often show the same symptoms for over- or under-watering (limp, yellowing leaves), so you can't always rely on them to tell you. However, you don't need any fancy gadgets to tell you when you need to water — simply insert your index finger to the second knuckle into the potting mix. If it's dry, water, but if it's moist, you can leave watering for a few days. As a general rule, water once every week (until water runs out of the drainage holes), but extend this to 7-10 days during the cooler months.