What brush is best to use, how much pressure is best? i have a Graphire4 Classic, i cant seem to create stuff like what i see off other people
What? That's like saying you bought a brush but you can't paint like Michelangelo. "What brush to use?" Just go take an art class or something. Pressure sensitivity is personal preference.
Everyone will have different preferences with a tablet, just like everyone has different preferences with everything. Just experiment around until you find settings you like. Personally, I can't do crap with my tablet, but that's more because I'm too lazy to really bother with it.