Ok, the main thing is that no one ( at least in the US) that are under 18 can sign a legal contract, so your parents have to be invovled in all contract and choices.
Next there are a dozen people in every city in every nation that want to be a singer.
What you need to do, decide first what type of singer you want to be opera, country western, rap or what.
Next you want to take voice lessons to learn to control your notes, proper breathing and also how to read music.
Next ( and at the same time) you will need to perform any and everywhere you can. Go out and sign at some of the nursing homes, if your music is ok for them, gangster rap may not work at most of them.
Look up vetern groups and offer to intertain at various meetings.
Now that signing will be free of charge and often you will sign for free or at a loss for several years just to get known. Also many areas have open mike nights and/or karoke nights ( similar system)
You need to work on about 30 minutes to 60 minutes of songs that you know by heart and have the music to ( or can play the music to)
It will have to be a music only CD or tape that you sign to.
Practice talking to the people between the songs, practice in front of a mirror thinking of stage presence.
Next after you get good, got your pitch and tone down great, got your breathing down good, you cut a demo CD at a recording studio. It can be from taped music as long as there is no copyright or if you have paid the fee to use the music.
Most modern music has a copyright so if you use it professionally, you will have to pay the original artist for the right to use their music. If you record their music, you have to agree to pay a set fee per CD you make.
With a CD in hand, you submit it to dozens and doznes of recording studios. You may never get one to use you.
You will get a dozen offers for people to "record" you if you pay them a fee. One of those in Nashville will cut your record but you have to pay about 10,000 dollars. They offer to submit it to big name labels, but often can never tell you one perosn that actually made it big using them.
Now you will often want to go to "showcases" these do cost often from 10 to 100 dollars, they normally do have various recording people there that are looking for new talent.
So this is why your parents have to be invovled, getting into this will cost money, take a lot of time, They will have to drive you and drive you every few days somewhere to do something, and often this will cost gas, maybe eating out a meal and you will have to have back up tapes, a player you can sing to, a amp, mikes and so on.