Great country guitar tone comes from a great guitar, plugged into a tube amp and some basic effects, reverb, delay (slap-back), and sometimes tremelo, or chorus.

You've got a decent guitar for the job. But in my opinion the amp will be your biggest obsticle to overcome. Marshall amps just don't sound country to me, never have. I've used just about everything out there. My best advice is trust your ears first and posts from people second.

What works for me is getting the cleanest possible sound first, with pickups that are clean, single-coil (about 80% of them time anyway), and that break up when you play hard. Run that into a really good sounding tube amp with a 15-40 watt (max) power rating (depending on how big the areas you are playing are). Then put an Ibanez TS-808 and good compressor pedal between the guitar and amp and run anything that doesn't boost the signal in through the effects loop of your amplifier (so yes...buy a Tube amp with an effects loop).