I'm not a good tuner myself, but I own the Yamaha stage customs (entry-level, like yours) and I've come up up with a pretty good sound for these drums. I suppose it makes no difference if the kit is entry-level or professional. All kits deserve the best heads. I have only used Remo heads, just because not many models from other manufacturers are available in my country, Greece. I put clear Pinstripes on tops of toms and front of bass drum, with clear ambassadors on the bottoms of toms and an ebony ambassador with a large centered hole on the back of the bass drum. My snare also gets a clear ambassador on the bottom side, but although it is 3.5" in depth I put a clear Emperor on top, so that it doesn't break easily. I suppose that all manufacturers offer drumheads of very good quality. To achieve some nice results, try using heavier heads on tops of snares, toms and the front of the bass drum(when I say "front" of the bass drum I mean the head the beater touches, it may be the other way round). Also, tune bottom heads tighter than the heads on top. If you do it the opposite way, the sound is going to be pretty dry. Try to use heads from the same manufacturer (I can't really explain why, but I think it is better) and experiment with tuning. The best thing I ever did was buying a TAMA tuner, witch allows me to tune everything exactly the same, without the "ear" experience usually required. It is a bit expensive, though, and won't work with die-cast hoops. (But I think that no drum company uses such hoops on entry-level kits). Also, check an article by John Riley at
www.remo.com about tuning.
Hope this was helpful!