What a cutie! Mine is 17 years old and probably over 100 pounds. Where are you located? You should raise him or her indoors now but eventually he will have to move outdoors. It is easier in a warm climate.
It's a good thing you're finding us now, before winter sets in, because since you know nothing about your tortoise's species you may not know that they don't hibernate. They come from an area of Africa that doesn't get cold enough for the tortoises to hibernate. This means you have to keep this baby warm during the winter.