COmplete NOOB-need help

Just downloaded Ardour, now ive got a bit of knowledge of mixing and such and my band recently recorded some stuff,(drums, bass, 2 guitars, vox) but the mixing by the guy who did it is rubbish, I’ve taken it upon myself to try and fix them up, Downloaded ardour but have absolutly no idea if anyone can give me the most basic run through, it seems i have no compressors, or eqs just pan and etc, i guess i need plug ins, but yeah just treat me as though i have no idea. im running osx 10.5.8, THANK YOU too all who help

@majestyofrock: and in particular