No, you cannot use it as a tabletop model as built-In oven should be built into a cabinet as the sides are expose without any paneling. Therefore, the expose sides of the oven will be very hot when used.
Oven cooking is by convection i.e. using heating elements to heat up the air in the oven cavity, therefore the food gets cooked from outside in. What temperature you should set depends on the recipes chosen.
An indicator light above the temperature selector will come on, once the temperature has reached, the indicator light will go off. This means you can place the food into the oven for cooking.