Welcome to the Orchid Board! That is a very pretty Phalaenopsis hybrid.
Your plant looks healthy. Water it by soaking the contents of the pot when the medium is completely dry. Then let it dry out again.
Your home probably has lower relative humidity and temperature than the greenhouse where the plant grew. It is normal for the roots to look like yours when moved to or grown in lower humidity or temperature. The ones lower in the pot look great.
Flowers don't last forever. They fade and fall off. If new buds are drying up and falling off, it is because of the sudden change of humidity or temperature, or because you haven't watered enough. But remember to let the plant dry out between watering, or the roots will rot.
The tan hole in the leaf looks like something scraped or poked the leaf. It is not a disease.
Orchids need fertilizer, yes, to grow. But winter approaches. It won't grow much during the winter, unless you keep your house quite warm. So, it won't need much fertilizer until next spring. This will give you plenty of time to read about growing orchids.
There are some threads here that will help you a lot. You can find these if you go to the left menu, click Forums, and then click Beginner's Forum. They are in the sticky threads at the top:
The Phal abuse ends here.
Using skewers to determine when to water
HELP FOR MY ORCHID
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