Software refers to a set of instructions that tells the computer what to do These instruction sets are called?

Programs

That's a bit vague: it could be a program, an operating system, any form of input, code, microcode, BIOS, data... and many other things.

bios? or registry?

You could either a) program them in by learning a computer code-base like c++ or use an easier method like macro. Microsoft Word uses a macro system.

Programs