Tyical instructions are 'display a point' (at a given location), 'display a line' (from one point to another), etc. For display systems with a character generator, there will be instructions to display characters or strings.
There is also usually a jump instruction, so that the display can continually refresh, by jumping back to the start of the display program. That also allows the display program to be built up out of smaller sections. Conditional branches are not usually provided, however.