No I want to keep one as a pet for like a week or two
oh dear tht would be a really foolish thing to do!!!
i have two lizards, 1's 2 foot and the others only like 9 inches
each have very different and unique requirements,
you would need to keep it in a vivarium which is the most important bit, its a glass tank with ventilation in the sides and a mesh top, you would need to provided a heat source, depending on the type of lizards you would need to provide a Uv light as well,
reptiles are very prone to stress and it will most likely die even if you get all this stuff which would cost well in access of £150.
all in all its not a very good decision to make, its best if you just leave them wild.