Definitely will help. Even after 20+ years of R/C, I STILL use Realflight to practice new maneuvers both fixed wing and helis, before trying them in reality. I have a progression I use which has saved me a lot of grief when learning new maneuvers. I start on the sim, then move into the real world on one of my "park" flyers, then after perfecting it there, move up to my giant scale stuff. Giant scale can be quite pricy, so this method has allowed me to fly Giant scale for about 6 years, with no crashes (of the giant scale planes), at least so far!
CAP is quite right, an instructor can make all teh difference in the world, although with helis, i taught myself, I did so after flying fixed wing for 15+ years. As a neophyte, you would be MUCH better off with an instructor.