woof and I here are the GIMPers, along with Tommygun(did he switch programs btw?), but Tommy was injured fighting a Grizzly bear with a spoon, so you might not hear much from him. If you have any questions, feel free to ask. I suck at giving a basic sweep of things, but ask me questions and I can try to answer them. I've been running GIMP since december, so I'm pretty familiar with most of the interfaces.
great sites and downloads to start you off.:
www.dafont.com - many of the fonts we all use, 100% free (becareful on copyrights)
http://greentunic.deviantart.com/art/Fractal-Pack-4-150661301 - a 4 pack of fractals that'll add spice to any design. Fractals, in my opinion, are great for making backgrounds, adding simple lighting effects, and color.
www.Google.com - Used to search for almost any render/stock. Use key words like..." RPG render" or "RPG HD" to get what you want. A lot of the cooler images will be listed under "large" size, due to them mostly being a background, ect...
Word of advice, just pump out as many sigs as you can. The more work we see from you, the more we know how to help you and being active is a great helper to this process.
I would also highly recommend you read Ivy's
TIPS FOR APPLICANTS