EXS 24 Logic Sampler Users Group

Hello. I am really new to the Logic scene. I am a rap artist and 
recently switched to Logic because of the great reviews I have heared 
about it. I mainly have switched because I wanted to produce a 
proffesional sound. So in deciding to produce my own music I have a 
few questions...

#1... Does anyone know any vocal recording techniques that would best 
bring out my vocals to sound clean (rap wise for verses & Choruses)

#2... When im finished with the raw recorded vocals after recording  
(my music tracks are mostly going to be from exs sound mod)and enter 
into the mixing phase, what techniques does anyone know of that can 
get my music to sound "full" and high quality instead of just comming 
at you directly in the monitors.

Is this process better done with a mastering program after the mix? I 
use samplitude (which is another program I have to learn for 
mastering techniques) So my final question is...

#3... Is it better for me to touch up in samplitude rather than Logic?
Thanks...