Make sure it has a comfortable terrarium too fit that particular lizard. If it likes to climb or hide, make sure it is able to do so. Give it plenty of water, the right food, and the right amount of heat.
this depends on the type of lizard that you have. you should go to a local pet shop and ask them what to do. However, in general you want to make sure the food is smaller than the space between their eyes.
Different lizard species have very different care from one another. Leoplard Geckos and Bearded Dragons do well with fairly high temps and low humidity whereas many gecko species need lower temperatures and higher humidity than the Bearded Dragons can take. You should do some research into the specific care of some lizards that you are interested in.