List at least four items that would be found on a desk in a computer room

As it is a computer room, there would mostly be computer equipment.

ordenador/computadora - computer

keyboard - teclado

mouse - ratón

speakers - altavoces

En la mesa hay un ordenador, un teclado, un ratón y dos altavoces.

or

En la mesa están un ordenador, un teclado, un ratón y dos altavoces.

When we are describing a place and want to tell if THERE IS/ARE something, we can use the verb estar (to be, referring to the location of the things) or the verb haber (only third person singular HAY).

Other vocabulary: libros (books), cables (cabls), portátil (laptop), tableta (tablet), cuaderno (notebook), etc.