I would say that for someone with little experience of photography and digital editing this is quite a good shot - but there are problems.
I like the idea and composition of the shot although it will not be to everyone's taste. Unfortunately it looks like the weather was not too good and hence the shot is a little dull and hazy. I will mention a few problems with the picture in a moment but as a piece of general advice to start with I would recommend you look at this link to a good photoshop workflow which I have found helpful in the past :
If you practice using the techniques in this workflow I think you will soon be able to spot and correct many of the common problems in your pictures.
In the example you have provided I would start by looking at the crop and whether the shot is level. There is a lot of dead space at the top of the picture so you could crop out some of this. Also the horizon is sloping from left to right so you need to rotate the frame clockwise to make the horizon level. The shot looks a little grainy but the aircraft is rather soft in places so there may be some issues with the way you have tried to sharpen the image. The picture is rather dull but I don't think there is much you can do about this in the editing - it is more down to the weather on the day.
This brings me to the basic photography. It would be good to know what sort of camera (and lens if it is an SLR) that you are using but the following very basic advice will apply to any camera.
1) Try and shoot in good weather - bright day, dry, not too much wind
2) Get as close to the subject as you safely can.
3) Set your camera on the highest quality / digital resolution setting
4) If you can adjust the ISO keep this to a low number to maximize quality (ISO 100 is a good number provided the light is reasonable).
5) Initially at least stick to static or slow moving shots.
6) Adjust aperture to give good depth of field. (a seeing around f8 is usually a good starting point)
7) Adjust shutter speed to minimize camera shake. (This will also depend on light and the size of lens you are using but I would say aim around 250th of a second as a general purpose setting).
Please note that items 6 and 7 have to be traded against each other to get correct exposure and this is something you will need to experiment with. As you get more experienced you will develop your own ways of doing things and be able to adjust your settings to different conditions. To help with this I would strongly recommend you read some books on basic photographic techniques.
Hope this is of some help.
All the best
[Edited 2005-08-05 11:09:09]
One thorn of experience is worth a whole wilderness of warning.