So personally, what I would do, is in Logic place a reference track(a track that you would like your songs to emulate) in your arrangement so you can mix along side that track and try to emulate the significant elements you hear. I was once new, so I know how it feels to be in this stage.
All I can say is keep making more and more music, and your skills will develop and eventually you will get there! But watch YT tutorials and keep learning new techniques. Stay positive, I really see potential in you!