Thanks for pointing my mistakes out, Maddrummer. I only hope with time my composition skills improve.
Being a self-learner I've always had a problem keeping the rules of what's allowed and what's not in my head and following them. Is there any way that could help me understand or systematize those rules? Are they closely related to the history of music in which case I should read something on it? Do you care to give me a short explanation that would send me in the right direction?
What I've done so far is the following. A few years ago I realized that nothing in music was of a greater interest for me than baroque counterpoint writing.
My first experiments were poor, so I searched all over the web for information on how Bach taught his students. I think I found everything regarding this subject. His students said he would start with teaching them realize figured bass to learn harmony. What I've done to substitute for that (having no knowledge of harmony or figured bass) was writing out vertical developments in Bach's scores. I quickly realized there was no end to the depth you could choose to write out harmony with. You could limit yourself to just the main functional developments, but then the harmony lost its beauty and charm. The secret was in the voice leading that created those harmonic changes. Yet I spent some time doing just that: writing out the vertical.
Then I went to Bach's inventions (just like his students did) and without the knowledge of analysis, I would simply compose a subject of my own and apply the same developments to it that an invention had. It sounded great but it wasn't actually me. It was Bach.
Doing the above I found how the ways of subject imitation worked and was able to track them down in different voices in the inventions, while continuing to pay attention to harmonic changes. Soon I noticed that my own composition experiments weren't as depressing as before,which gave me some hope.
Of course I read the existing analysis of some inventions,but it never revealed to me more than hearing a piece itself.
So I realized I needed to work out my own criteria of analysis.
All of the above took me about four years, considering a day job (I am an English teacher) and my poor analytical abilities, but I am not going to stop.
Sorry for a lengthy post, but I guess I could use some guidance.