I don't know if this is helpful, but, I know very little about music theory, but managed to get enough info to create my own melodies using this really good website known as:
http://www.hooktheory.com/hookpadIt look complicated at first, but they its pretty easy to get a hang of it if you buy the book (which is something I reluctantly did). But it basically allows you to create a complete melody with chord progression, etc. I know nothing about music theory, but know enough to make something from this website now. So, if no one is able to help, you could always try this for something. Anything.
Sorry if this isn't what you want, but it could help?
Safwan