I have lots of ideas that I've recorded but I'm not really sure how to put them together.
if they weren't written together, then they probably are not part of the same song. i think if you try to put them together they may look like awkward surgery. So, pick 1, and then 'play doctor' with it. give it a diagnosis. Is it the beginning of the song? is it not the beginning of the song? is it a 'chorus'? is it not a chorus? What does this idea mean to you? try to remember everything about the circumstances of coming up with it. This should lead you to your next decision about what it needs. Another thing that i should mention about the way i do it, i always write the entire song all the way through before even touching the production process. I know that not everyone does it this way, but, i've found out, to play to my strengths it's important to remain as nimble as possible during the writing process, and that means not trying to actually produce it while writing. i am a 'write first' person, then produce what i wrote. Also another thing i should mention, i was in your situation (wanting to produce entire songs myself) and i knew i was qualified, because i had already been playing multiple instruments for at least 10 or 15 years before, so i thought it should be easy. but unfortunately it took me at least 10 MORE years after that before i really felt like i could comfortably get the entire job done. actually i'm still not really there yet. But who knows ..... maybe you will find a way to make things.... simpler