writing technique is very subjective..
getting a partner wont mean you will become a better writer although sometimes it is..
no one can teach you how to write,just like no one can teach you to be a better painter.they can just teach you how to paint.how good you become depends on your talent..

most A & R rep (this is the person you send your demos to at music label) have an ear for good songs..they dont usually care how good or bad you sing..their job is to recognise good song and if your song is good then it doesnt matter if you sing like chipmunk..a demo with just vocal is fine,although this is usually accompanied by instruments..its easier to write if you can play instruments..(this is if you are a songwriter,not a singer)

if your song is recognised and you get signed,its not your job to turn the song into a great song, its the producer's job (great producers such as timbaland,david foster,diane warren)..producers have this talent of turning a simple song into the best they can sound...say you send a demo of a song played with a single piano and vocals,this producer will then think of the bass line,guitar leads,piano leads,drum beat,tempo and etc....

this is when it gets very tricky..i aint very sure about copyright,but you wont be able to get your song 'copyrighted' unless you are signed...music publishers will get your songs copyrighted if you are signed to them..as an individual,i dont believe any law in malaysia will allow you to get your song copyright/published..

so which means you are not protected and wont be able to get your song copyrighted unless you are signed to a publisher..and it is not easy getting signed to a publisher..getting signed to a publisher is the first step to becoming a professional song writer..once signed,you get paid for your work..

but i have not heard of any publisher/music label stealing songs from demo send in by song writer...so i think its quite safe to do so..and lets just say your song is very very good,i would think they rather sign you up for your potential rather than steal 1 song from you...

many individuals upload their original songs to youtube..this is a way to protect yourself because there is a record of the date your songs is uploaded which means you are the original writer..and music labels cant steal your song because the public have listened to your composition and there would be witnesses to it..i have heard people getting signed from music labels by posting their music on the net,but not sueing the music labels for stealing their ideas...

if someone is going to use your work for his/her own benefit and get payment from it, you are entitled to a percentage of that payment..this very much depends on the agreement between both parties..