Jaz,
It really depends on what each of the devices have. For example, a TV might have a VGA connector and you could connect the laptop directly to the TV with only a VGA cable (no adapters.) You'll need to look at what the TV has and what the laptop has and see if anything already matches. If nothing does, then you'll just need to find an adapter from one to another. (For example, let's say the laptop has a VGA out, but the TV only has coax, then you'll need a VGA to coax converter.)
BTW, you can find a whole bunch of converters online, like http://search.cablestogo.com/?N=0&Ntt=sbns+vga+to+coax+converter (just an example - there are many companies with many different kinds of converters that should meet your needs.)