Those are really not bad at all. The only advice I can give is really more just telling you what worked for me--I found flying insects to be almost impossible initially. I started trying macro on inanimate objects, then on flowers. That--and annoying Charlie/cgipson non-stop with questions--helped me figure out the best shutter speeds, aperture, etc to get sharp results with something that doesn't move around too much. THEN I started trying to hit focus on things that wanted to constantly move away from me! I'm STILL trying to get that down!
Oh--and learn to use flash. Especially diffused flash, for the insects. That makes a lot of difference!
I just love my Tokina 100mm f/2.8. I got a really great deal on a used one at
keh.com.
Before I had the macro, I used a set of Kenko extension tubes. So far, I've kept the tubes, because I could still use them as well, but I found getting a really good, sharp focus to be extremely challenging with the extension tubes. I haven't tried using them since I've gotten better with my macro lens, so I may give them a try this week and see if learning to use the macro lens will make it any easier to use the tubes as well.
The tubes are not a bad investment, imo, if you simply can't find any way to get a macro lens and want to at least play with it some. But make sure you get decent tubes, not the cheapo ones. It's hard enough even with the good ones to get really good, sharp quality images.