I'm not exactly the best person to reply, far from it, but as far as i'm aware the only advice you can can be given on creating melodies is to learn a little bit about music scales and chord progression.
This is a link to a great free pdf which gives alot of information about scales and cords, how to use cords, which notes sound good together and a lot more.
http://www.kwookyworld.com/rsg2mt/rsg2mt.pdf
If you've got no musical knowledge at all, like myself, then this will help immensly. It will save ALOT of time just aimlessly placing notes in the piano roll till something sounds nice.
P.s. Again if you have no musical knowledge, it will probably be a bit of hard reading with alot of back-tracking, (it's how i found it anyhows, my brain isn't used to absorbing lots of knowledge in a short space anymore ) but it is well worth a read.
Hope that's helpfull.
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