I agree with MichaelW, especially since you mentioned the bike is relatively new. There should be a barrel adjuster somewhere on the front derailleur cable. Look for it either as an "in-line" adjuster, or at a point where the cable meets the frame. There is usually one there.
Shift your bike into the Middle and then the extreme inside (largest cog in the back) and adjust the barrel adjuster to the point where it barely touches the inside of the front derailleur (FD). Then shift the RD to the smallest cog and see if the chain rubs the outside of the FD. Adjust the cable tension of the FD to a compromise between these two. It's a fine line between too much and not enough, and with many 9-speeds, there is usually a tiny amount of rubbing at either end of the spectrum.
Once you middle chainring is adjusted (centered in this fashion) check the small and big rings to make sure they shift well (They Should!). If the chain doesn't want to drop to the small chainring, the inside limit screw may be in too far. Likewise if you can't shift onto the big ring.
Good Luck.
L8R
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