Darn already ordered that stand, should have asked on here first about those!
What is a modifier?
Thanks for the help! Much appreciated!
It's any device used to change the nature of the light.
A small flashgun at a reasonable distance from a subject is a small point source of light, it'll create harsh dark shadows.
To alter the quality of the shadows you need to make the light softer and slightly less directional. The cheapest way is to bounce it off a wall or celing (but they have to be handy and white to avoid colour casts).
Next up is a shoot through umbrella, it softens the light nicely - but you lose some light back from it, which then gets reflected all over the place and disturbs the directional light you'd set.
Next up is a reflective brolly, more controllable than the shoot through, but slightly less soft.
Then there's softboxes, softer, more controllable, which can be gridded for better shadow control
Beauty dishes, soft light with harder edged shadows
All sorts of more specialist items, but you should have the basics there.