Welcome aqkua
Okay, since you are already using Gigasampler (and a sequencer to control it I assume), I only need to help you with your second question: Sounds
Go to any music store, and order a few AKAI CD ROMS!
AKAI CDROMS can be imported on your hard drive and converted as .gig (gigasampler instruments) using the AKAI CONVERSION tool installed with Gigasampler. Its easy, simply put the AKAI CDROM in your player, and select the instruments you want to batch convert on your hard disk.
Ahhh... Some good AKAI CDROMS: Distorted Reality II (Double CD), Symphony of Voices (5CD set), Synclavier Strings, DrumnBass resonance, XXL 1500 Drum Loops, Hollywood Edge Sound FX collecion...
There are hundreds of good AKAI CDROMS... By the way, these are NOT Audio CDs to sample... no.. its straight programmed instruments for AKAI samplers, and Gigasampler (using the import program)
Good luck, let me know if you have any problem!
Nice to see you around.