Well, first off, nice to meet you! ^_^ I'm Victoria!
Hooy, I've never made weapons before, but I suggest you find alot of reference pictures of gunblades and look at them. Is there any materials in your house you could use to make a gunblade?
http://amethyst-angel.com/cosplay.html Secondly, here, this is a site I found before Halloween, when I searching for reference pictures to do Vincent Valentine's glove. Check out the tutorials to see if there is anything that could help you when making your gunblade - see if they did anything with swords that you could adapt for your own project.
Also, they do commissons! ^^ Maybe you could take a look at that.
Ano, and the belts? Well, is there any thrift shops around? Those are the greatest things for cosplayers, I think. If you see a belt that looks Squall-ish, grab it, even if it's the wrong color! YOu could always paint it, touch it up. If one belt as a right kind of buckle Squall has, buy it and piece things together! Go for it, Squall Leonheart!
*Gives you a Poky box* Luck to you! And I hope I can get to know you better!
- Rin Rin