How to read, and write, music notation. How to match what chords, notes and keys there are to certain symbol such and such on a musical sheet? Incidentally, how do I even read guitar tabs.

What software should I use, other than MuseScore..

Are there any tools where I can sing my melody and make them converted into music notes?

I'm try hard at, seeking which guitar chords suit my self-writen-and-composee songs

I found two awesome tools!

ScoreCloud Studio and ScoreCloudSongwriter.

Sing and turn, so it seems, to music sheet!