As has been said we really need to see a photo or two to give a positive id, but it is most likely a Slider or Cooter. On this basis, a male has long front claws and a thick tail. They need to be a certain age/size to sex for definite. If you have a female she could reach 12"+. The recommended amount of water is 40 litres per inch of shell, so a much larger tank/indoor pond set up is needed. No gravel or lid on the tank.
UVB and a basking area area must. The turtle needs to be able to climb safely out of the water to bask and dry off. Shedding is natural and the scutes will come away, but do not pick them. Fresh new ones should be seen but if there is any redness, ooziness or smell then this could mean shell rot.
A good diet of Reptomin, wheatgerm pellets, duckweed, pondweed, romaine lettuce and dandelion leaves is ideal. Water temperature 20c (depending again on species and size/age) and a basking area at least 10c warmer.
An external filter is a must - Eheim 2213, 2215 or 2217 are recommended. Amazon had the cheapest price, but they are forever going out of stock! Alfagrog is the recommended media.
I hope you didn't pay anything/much at all for him/her as there are so many being offered for free all the time, mostly because of the pure size they reach.
Once we have a correct id - photos showing the head, tail and front claws in particular - then a lot more help/advice can be given.
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