What happens next?

How to make a leopard gecko vivarium
First of all you will need the housing.
Get a 20 gallon (75.7 l) long terrarium or vivarium, but you could do with a 15 gallon (56.8 l). You could also use a rubbermaid tub but make sure the dimensions are at least 30 " x12 " and that it is tall enough for no escape.
You could get a tank with sliding doors instead, which would make taming easier. Buy, or have, a heating device.